mammalsleep: Mammal sleep data
Description
Dataset from Allison and Cicchetti (1976) of 62 mammal species on the
interrelationship between sleep, ecological, and constitutional variables.
The dataset contains missing values on five variables.
Format
mammalsleep is a data frame with 62 rows and 11 columns:
- species
- Species of animal
- bw
- Body weight (kg)
- brw
- Brain weight (g)
- sws
- Slow wave ("nondreaming") sleep (hrs/day)
- ps
- Paradoxical ("dreaming") sleep (hrs/day)
- ts
- Total sleep (hrs/day) (sum of slow wave and paradoxical sleep)
- mls
- Maximum life span (years)
- gt
- Gestation time (days)
- pi
- Predation index (1-5), 1 = least likely to be preyed upon
- sei
- Sleep exposure index (1-5), 1 = least exposed (e.g. animal sleeps in a
well-protected den), 5 = most exposed
- odi
- Overall danger index (1-5) based on the above two indices and other information, 1 = least
danger (from other animals), 5 = most danger (from other animals)
Source
Allison, T., Cicchetti, D.V. (1976). Sleep in Mammals: Ecological and
Constitutional Correlates. Science, 194(4266), 732-734.Details
Allison and Cicchetti (1976) investigated the interrelationship between
sleep, ecological, and constitutional variables. They assessed these
variables for 39 mammalian species. The authors concluded that slow-wave
sleep is negatively associated with a factor related to body size. This
suggests that large amounts of this sleep phase are disadvantageous in large
species. Also, paradoxical sleep (REM sleep) was associated with a factor
related to predatory danger, suggesting that large amounts of this sleep
phase are disadvantageous in prey species.