SLEEP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

http://science.education.nih.gov/supplements/nih3/sleep/guide/info-sleep.htm

Table 2. Representative Total Sleep Requirements for Various Species
Species Average Total Sleep Time (hours/day)
brown bat 19.9
python 18.0
owl monkey 17.0
human infant 16.0
tiger 15.8
squirrel 14.9
golden hamster 14.3
lion 13.5
gerbil 13.1
rat 12.6
cat 12.1
mouse 12.1
rabbit 11.4
jaguar 10.8
duck 10.8
dog 10.6
bottle-nosed dolphin 10.4
baboon 10.3
chimpanzee 9.7
guinea pig 9.4
human adolescent 9.0
human adult 8.0
pig 7.8
gray seal 6.2
goat 5.3
cow 3.9
sheep 3.8
elephant 3.5
donkey 3.1
horse 2.9
giraffe 1.9
Sources: References 1, 5, 16, and 36.