{
  "type": "ranking",
  "url": "https://karelbusta.dev/data/sleep/animals-that-sleep-the-most",
  "title": "Which animals sleep the most?",
  "description": "83 mammals ranked by daily sleep. Little brown bats sleep 19.9 hours a day, opossums and armadillos are close behind. Data from Savage & West (2007).",
  "headline": "The little brown bat sleeps 19.9 hours a day, more than any other mammal on record.",
  "published": "2026-10-14",
  "rankedBy": {
    "column": "sleep_total",
    "order": "desc",
    "unit": "h/day"
  },
  "columns": [
    {
      "description": "Common name as given in the source.",
      "key": "name",
      "label": "Species",
      "type": "string"
    },
    {
      "description": "Taxonomic order (added by ggplot2 from Wikipedia).",
      "key": "order",
      "label": "Order",
      "type": "string"
    },
    {
      "description": "Source code: carni, herbi, omni, insecti (added by ggplot2 from Wikipedia).",
      "key": "vore",
      "label": "Diet",
      "type": "string"
    },
    {
      "description": "Total sleep time per 24 h. Cetaceans: halved by Savage & West for unihemispheric sleep.",
      "key": "sleep_total",
      "label": "Total sleep",
      "type": "number",
      "unit": "h/day"
    },
    {
      "description": "REM sleep time per 24 h.",
      "key": "sleep_rem",
      "label": "REM sleep",
      "type": "number",
      "unit": "h/day"
    },
    {
      "description": "Body mass.",
      "key": "bodywt",
      "label": "Body weight",
      "type": "number",
      "unit": "kg"
    }
  ],
  "rows": [
    {
      "rank": 1,
      "name": "Little brown bat",
      "sleep_total": 19.9,
      "sleep_rem": 2,
      "bodywt": 0.01,
      "order": "Chiroptera",
      "vore": "insecti"
    },
    {
      "rank": 2,
      "name": "Big brown bat",
      "sleep_total": 19.7,
      "sleep_rem": 3.9,
      "bodywt": 0.023,
      "order": "Chiroptera",
      "vore": "insecti"
    },
    {
      "rank": 3,
      "name": "Thick-tailed opposum",
      "sleep_total": 19.4,
      "sleep_rem": 6.6,
      "bodywt": 0.37,
      "order": "Didelphimorphia",
      "vore": "carni"
    },
    {
      "rank": 4,
      "name": "Giant armadillo",
      "sleep_total": 18.1,
      "sleep_rem": 6.1,
      "bodywt": 60,
      "order": "Cingulata",
      "vore": "insecti"
    },
    {
      "rank": 5,
      "name": "North American Opossum",
      "sleep_total": 18,
      "sleep_rem": 4.9,
      "bodywt": 1.7,
      "order": "Didelphimorphia",
      "vore": "omni"
    },
    {
      "rank": 6,
      "name": "Long-nosed armadillo",
      "sleep_total": 17.4,
      "sleep_rem": 3.1,
      "bodywt": 3.5,
      "order": "Cingulata",
      "vore": "carni"
    },
    {
      "rank": 7,
      "name": "Owl monkey",
      "sleep_total": 17,
      "sleep_rem": 1.8,
      "bodywt": 0.48,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 8,
      "name": "Arctic ground squirrel",
      "sleep_total": 16.6,
      "sleep_rem": null,
      "bodywt": 0.92,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 9,
      "name": "Golden-mantled ground squirrel",
      "sleep_total": 15.9,
      "sleep_rem": 3,
      "bodywt": 0.205,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 10,
      "name": "Tiger",
      "sleep_total": 15.8,
      "sleep_rem": null,
      "bodywt": 162.564,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 11,
      "name": "Eastern american chipmunk",
      "sleep_total": 15.8,
      "sleep_rem": null,
      "bodywt": 0.112,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 12,
      "name": "Tenrec",
      "sleep_total": 15.6,
      "sleep_rem": 2.3,
      "bodywt": 0.9,
      "order": "Afrosoricida",
      "vore": "omni"
    },
    {
      "rank": 13,
      "name": "Greater short-tailed shrew",
      "sleep_total": 14.9,
      "sleep_rem": 2.3,
      "bodywt": 0.019,
      "order": "Soricomorpha",
      "vore": "omni"
    },
    {
      "rank": 14,
      "name": "Western american chipmunk",
      "sleep_total": 14.9,
      "sleep_rem": null,
      "bodywt": 0.071,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 15,
      "name": "Round-tailed muskrat",
      "sleep_total": 14.6,
      "sleep_rem": null,
      "bodywt": 0.266,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 16,
      "name": "Northern grasshopper mouse",
      "sleep_total": 14.5,
      "sleep_rem": null,
      "bodywt": 0.028,
      "order": "Rodentia",
      "vore": "carni"
    },
    {
      "rank": 17,
      "name": "Mountain beaver",
      "sleep_total": 14.4,
      "sleep_rem": 2.4,
      "bodywt": 1.35,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 18,
      "name": "Three-toed sloth",
      "sleep_total": 14.4,
      "sleep_rem": 2.2,
      "bodywt": 3.85,
      "order": "Pilosa",
      "vore": "herbi"
    },
    {
      "rank": 19,
      "name": "Golden hamster",
      "sleep_total": 14.3,
      "sleep_rem": 3.1,
      "bodywt": 0.12,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 20,
      "name": "Mongolian gerbil",
      "sleep_total": 14.2,
      "sleep_rem": 1.9,
      "bodywt": 0.053,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 21,
      "name": "Thirteen-lined ground squirrel",
      "sleep_total": 13.8,
      "sleep_rem": 3.4,
      "bodywt": 0.101,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 22,
      "name": "Phalanger",
      "sleep_total": 13.7,
      "sleep_rem": 1.8,
      "bodywt": 1.62,
      "order": "Diprotodontia",
      "vore": null
    },
    {
      "rank": 23,
      "name": "Lion",
      "sleep_total": 13.5,
      "sleep_rem": null,
      "bodywt": 161.499,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 24,
      "name": "Laboratory rat",
      "sleep_total": 13,
      "sleep_rem": 2.4,
      "bodywt": 0.32,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 25,
      "name": "Vole",
      "sleep_total": 12.8,
      "sleep_rem": null,
      "bodywt": 0.035,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 26,
      "name": "Musk shrew",
      "sleep_total": 12.8,
      "sleep_rem": 2,
      "bodywt": 0.048,
      "order": "Soricomorpha",
      "vore": null
    },
    {
      "rank": 27,
      "name": "Chinchilla",
      "sleep_total": 12.5,
      "sleep_rem": 1.5,
      "bodywt": 0.42,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 28,
      "name": "Domestic cat",
      "sleep_total": 12.5,
      "sleep_rem": 3.2,
      "bodywt": 3.3,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 29,
      "name": "House mouse",
      "sleep_total": 12.5,
      "sleep_rem": 1.4,
      "bodywt": 0.022,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 30,
      "name": "Arctic fox",
      "sleep_total": 12.5,
      "sleep_rem": null,
      "bodywt": 3.38,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 31,
      "name": "Cheetah",
      "sleep_total": 12.1,
      "sleep_rem": null,
      "bodywt": 50,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 32,
      "name": "Deer mouse",
      "sleep_total": 11.5,
      "sleep_rem": null,
      "bodywt": 0.021,
      "order": "Rodentia",
      "vore": null
    },
    {
      "rank": 33,
      "name": "Cotton rat",
      "sleep_total": 11.3,
      "sleep_rem": 1.1,
      "bodywt": 0.148,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 34,
      "name": "Potoroo",
      "sleep_total": 11.1,
      "sleep_rem": 1.5,
      "bodywt": 1.1,
      "order": "Diprotodontia",
      "vore": "herbi"
    },
    {
      "rank": 35,
      "name": "Slow loris",
      "sleep_total": 11,
      "sleep_rem": null,
      "bodywt": 1.4,
      "order": "Primates",
      "vore": "carni"
    },
    {
      "rank": 36,
      "name": "Potto",
      "sleep_total": 11,
      "sleep_rem": null,
      "bodywt": 1.1,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 37,
      "name": "Patas monkey",
      "sleep_total": 10.9,
      "sleep_rem": 1.1,
      "bodywt": 10,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 38,
      "name": "Mole rat",
      "sleep_total": 10.6,
      "sleep_rem": 2.4,
      "bodywt": 0.122,
      "order": "Rodentia",
      "vore": null
    },
    {
      "rank": 39,
      "name": "Jaguar",
      "sleep_total": 10.4,
      "sleep_rem": null,
      "bodywt": 100,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 40,
      "name": "Star-nosed mole",
      "sleep_total": 10.3,
      "sleep_rem": 2.2,
      "bodywt": 0.06,
      "order": "Soricomorpha",
      "vore": "omni"
    },
    {
      "rank": 41,
      "name": "Desert hedgehog",
      "sleep_total": 10.3,
      "sleep_rem": 2.7,
      "bodywt": 0.55,
      "order": "Erinaceomorpha",
      "vore": null
    },
    {
      "rank": 42,
      "name": "Dog",
      "sleep_total": 10.1,
      "sleep_rem": 2.9,
      "bodywt": 14,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 43,
      "name": "European hedgehog",
      "sleep_total": 10.1,
      "sleep_rem": 3.5,
      "bodywt": 0.77,
      "order": "Erinaceomorpha",
      "vore": "omni"
    },
    {
      "rank": 44,
      "name": "Macaque",
      "sleep_total": 10.1,
      "sleep_rem": 1.2,
      "bodywt": 6.8,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 45,
      "name": "Grivet",
      "sleep_total": 10,
      "sleep_rem": 0.7,
      "bodywt": 4.75,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 46,
      "name": "Galago",
      "sleep_total": 9.8,
      "sleep_rem": 1.1,
      "bodywt": 0.2,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 47,
      "name": "Red fox",
      "sleep_total": 9.8,
      "sleep_rem": 2.4,
      "bodywt": 4.23,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 48,
      "name": "Chimpanzee",
      "sleep_total": 9.7,
      "sleep_rem": 1.4,
      "bodywt": 52.2,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 49,
      "name": "Squirrel monkey",
      "sleep_total": 9.6,
      "sleep_rem": 1.4,
      "bodywt": 0.743,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 50,
      "name": "Mongoose lemur",
      "sleep_total": 9.5,
      "sleep_rem": 0.9,
      "bodywt": 1.67,
      "order": "Primates",
      "vore": "herbi"
    },
    {
      "rank": 51,
      "name": "Guinea pig",
      "sleep_total": 9.4,
      "sleep_rem": 0.8,
      "bodywt": 0.728,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 52,
      "name": "Baboon",
      "sleep_total": 9.4,
      "sleep_rem": 1,
      "bodywt": 25.235,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 53,
      "name": "Lesser short-tailed shrew",
      "sleep_total": 9.1,
      "sleep_rem": 1.4,
      "bodywt": 0.005,
      "order": "Soricomorpha",
      "vore": "omni"
    },
    {
      "rank": 54,
      "name": "Pig",
      "sleep_total": 9.1,
      "sleep_rem": 2.4,
      "bodywt": 86.25,
      "order": "Artiodactyla",
      "vore": "omni"
    },
    {
      "rank": 55,
      "name": "Tree shrew",
      "sleep_total": 8.9,
      "sleep_rem": 2.6,
      "bodywt": 0.104,
      "order": "Scandentia",
      "vore": "omni"
    },
    {
      "rank": 56,
      "name": "Northern fur seal",
      "sleep_total": 8.7,
      "sleep_rem": 1.4,
      "bodywt": 20.49,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 57,
      "name": "African striped mouse",
      "sleep_total": 8.7,
      "sleep_rem": null,
      "bodywt": 0.044,
      "order": "Rodentia",
      "vore": "omni"
    },
    {
      "rank": 58,
      "name": "Short-nosed echidna",
      "sleep_total": 8.6,
      "sleep_rem": null,
      "bodywt": 4.5,
      "order": "Monotremata",
      "vore": "insecti"
    },
    {
      "rank": 59,
      "name": "Rabbit",
      "sleep_total": 8.4,
      "sleep_rem": 0.9,
      "bodywt": 2.5,
      "order": "Lagomorpha",
      "vore": "herbi"
    },
    {
      "rank": 60,
      "name": "Eastern american mole",
      "sleep_total": 8.4,
      "sleep_rem": 2.1,
      "bodywt": 0.075,
      "order": "Soricomorpha",
      "vore": "insecti"
    },
    {
      "rank": 61,
      "name": "African giant pouched rat",
      "sleep_total": 8.3,
      "sleep_rem": 2,
      "bodywt": 1,
      "order": "Rodentia",
      "vore": "omni"
    },
    {
      "rank": 62,
      "name": "Human",
      "sleep_total": 8,
      "sleep_rem": 1.9,
      "bodywt": 62,
      "order": "Primates",
      "vore": "omni"
    },
    {
      "rank": 63,
      "name": "Degu",
      "sleep_total": 7.7,
      "sleep_rem": 0.9,
      "bodywt": 0.21,
      "order": "Rodentia",
      "vore": "herbi"
    },
    {
      "rank": 64,
      "name": "Vesper mouse",
      "sleep_total": 7,
      "sleep_rem": null,
      "bodywt": 0.045,
      "order": "Rodentia",
      "vore": null
    },
    {
      "rank": 65,
      "name": "Gray hyrax",
      "sleep_total": 6.3,
      "sleep_rem": 0.6,
      "bodywt": 2.625,
      "order": "Hyracoidea",
      "vore": "herbi"
    },
    {
      "rank": 66,
      "name": "Genet",
      "sleep_total": 6.3,
      "sleep_rem": 1.3,
      "bodywt": 2,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 67,
      "name": "Gray seal",
      "sleep_total": 6.2,
      "sleep_rem": 1.5,
      "bodywt": 85,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 68,
      "name": "Common porpoise",
      "sleep_total": 5.6,
      "sleep_rem": null,
      "bodywt": 53.18,
      "order": "Cetacea",
      "vore": "carni"
    },
    {
      "rank": 69,
      "name": "Rock hyrax",
      "sleep_total": 5.4,
      "sleep_rem": 0.5,
      "bodywt": 3.6,
      "order": "Hyracoidea",
      "vore": null
    },
    {
      "rank": 70,
      "name": "Goat",
      "sleep_total": 5.3,
      "sleep_rem": 0.6,
      "bodywt": 33.5,
      "order": "Artiodactyla",
      "vore": "herbi"
    },
    {
      "rank": 71,
      "name": "Tree hyrax",
      "sleep_total": 5.3,
      "sleep_rem": 0.5,
      "bodywt": 2.95,
      "order": "Hyracoidea",
      "vore": "herbi"
    },
    {
      "rank": 72,
      "name": "Bottle-nosed dolphin",
      "sleep_total": 5.2,
      "sleep_rem": null,
      "bodywt": 173.33,
      "order": "Cetacea",
      "vore": "carni"
    },
    {
      "rank": 73,
      "name": "Brazilian tapir",
      "sleep_total": 4.4,
      "sleep_rem": 1,
      "bodywt": 207.501,
      "order": "Perissodactyla",
      "vore": "herbi"
    },
    {
      "rank": 74,
      "name": "Cow",
      "sleep_total": 4,
      "sleep_rem": 0.7,
      "bodywt": 600,
      "order": "Artiodactyla",
      "vore": "herbi"
    },
    {
      "rank": 75,
      "name": "Asian elephant",
      "sleep_total": 3.9,
      "sleep_rem": null,
      "bodywt": 2547,
      "order": "Proboscidea",
      "vore": "herbi"
    },
    {
      "rank": 76,
      "name": "Sheep",
      "sleep_total": 3.8,
      "sleep_rem": 0.6,
      "bodywt": 55.5,
      "order": "Artiodactyla",
      "vore": "herbi"
    },
    {
      "rank": 77,
      "name": "Caspian seal",
      "sleep_total": 3.5,
      "sleep_rem": 0.4,
      "bodywt": 86,
      "order": "Carnivora",
      "vore": "carni"
    },
    {
      "rank": 78,
      "name": "African elephant",
      "sleep_total": 3.3,
      "sleep_rem": null,
      "bodywt": 6654,
      "order": "Proboscidea",
      "vore": "herbi"
    },
    {
      "rank": 79,
      "name": "Donkey",
      "sleep_total": 3.1,
      "sleep_rem": 0.4,
      "bodywt": 187,
      "order": "Perissodactyla",
      "vore": "herbi"
    },
    {
      "rank": 80,
      "name": "Roe deer",
      "sleep_total": 3,
      "sleep_rem": null,
      "bodywt": 14.8,
      "order": "Artiodactyla",
      "vore": "herbi"
    },
    {
      "rank": 81,
      "name": "Horse",
      "sleep_total": 2.9,
      "sleep_rem": 0.6,
      "bodywt": 521,
      "order": "Perissodactyla",
      "vore": "herbi"
    },
    {
      "rank": 82,
      "name": "Pilot whale",
      "sleep_total": 2.7,
      "sleep_rem": 0.1,
      "bodywt": 800,
      "order": "Cetacea",
      "vore": "carni"
    },
    {
      "rank": 83,
      "name": "Giraffe",
      "sleep_total": 1.9,
      "sleep_rem": 0.4,
      "bodywt": 899.995,
      "order": "Artiodactyla",
      "vore": "herbi"
    }
  ],
  "dataset": {
    "title": "Sleep in mammals",
    "url": "https://karelbusta.dev/data/sleep/datasets/mammal-sleep",
    "source": {
      "citation": "Savage VM, West GB. A quantitative, theoretical framework for understanding mammalian sleep. Proc Natl Acad Sci USA. 2007;104(3):1051–1056. doi:10.1073/pnas.0610080104",
      "publisher": "Proceedings of the National Academy of Sciences",
      "sampleSize": "83 mammal species",
      "title": "Savage & West (2007), PNAS",
      "url": "https://doi.org/10.1073/pnas.0610080104",
      "year": 2007
    }
  }
}