{"type":"dataset","url":"https://karelbusta.dev/data/sleep/datasets/mammal-sleep","title":"Sleep in mammals","description":"Daily total and REM sleep, sleep-cycle length, brain and body weight for 83 mammal species, from Savage & West (2007) via ggplot2's msleep.","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},"also":[{"name":"ggplot2 msleep.csv (tidyverse/ggplot2, commit 737be17)","url":"https://github.com/tidyverse/ggplot2/blob/737be17f43bebac02ccb119753c1fee267572443/data-raw/msleep.csv"},{"name":"ggplot2 msleep documentation (R/data.R)","url":"https://github.com/tidyverse/ggplot2/blob/737be17f43bebac02ccb119753c1fee267572443/R/data.R"},{"name":"Savage & West (2007) full text on PubMed Central (PMC1783362)","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC1783362/"},{"name":"Rattenborg et al. (2008), Sleeping outside the box: EEG measures of sleep in sloths inhabiting a rainforest, Biology Letters 4(4):402–405","url":"https://doi.org/10.1098/rsbl.2008.0203"}],"license":"The msleep file is distributed with ggplot2 under the MIT License (Copyright (c) 2025 ggplot2 core developer team), https://github.com/tidyverse/ggplot2/blob/737be17f43bebac02ccb119753c1fee267572443/LICENSE.md. The measurements themselves are factual data compiled from published papers (Savage & West 2007, who took sleep times from Zepelin 1989 and body/brain masses mainly from Meddis 1983).","coverage":"83 mammal species across 19 orders; measurements compiled from laboratory and captive-animal sleep studies published up to 1989","retrieved":"2026-10-14","generated":"2026-10-14","caveats":["Almost all values come from EEG recordings of captive or laboratory animals; sleep in the wild can differ a lot.","Wild brown-throated three-toed sloths slept 9.63 h/day on EEG, over 6 h less than previously reported in captivity (Rattenborg et al. 2008); msleep lists 14.4 h.","Dolphin, pilot whale and porpoise totals were halved by Savage & West because these whales sleep one brain hemisphere at a time; they are not behavioural sleep times.","Diet (vore), order and conservation status were added by ggplot2 from Wikipedia around 2015, not by the paper, and conservation codes are not current IUCN assessments.","Some genus names are misspelled in the source (Capri, Cavis, Haliochoerus, Nyctibeus) and are kept as published.","Pilot whale and common porpoise: sleep_total + awake = 24.05 h, so one of the two is rounded.","Values were not cross-checked against the paper's supplementary Table 1, which could not be downloaded (see Methodology)."],"tables":[{"key":"species","title":"Sleep by species","description":"One row per species (83). 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