Bats sleep 18-20 hours per day.
5
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
44% of kids watch television before they go to sleep.
106
The average cat sleeps about 2/3 of the day.
203
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23