Description

The mammalsleep data frame has 62 rows and 10 columns. Sleep in Mammals: Ecological and Constitutional Correlates

Usage

Format

This data frame contains the following columns:

body

body weight in kg

brain

brain weight in g

nondream

slow wave ("nondreaming") sleep (hrs/day)

dream

paradoxical ("dreaming") sleep (hrs/day)

sleep

total sleep (hrs/day) (sum of slow wave and paradoxical sleep)

lifespan

maximum life span (years)

gestation

gestation time (days)

predation

predation index (1-5) 1 = minimum (least likely to be preyed upon) to 5 = maximum (most likely to be preyed upon)

exposure

sleep exposure index (1-5) 1 = least exposed (e.g. animal sleeps in a well-protected den) 5 = most exposed

danger

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

"Sleep in Mammals: Ecological and Constitutional Correlates" by Allison, T. and Cicchetti, D. (1976), Science, November 12, vol. 194, pp. 732-734.