A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Lack of water is the #1 trigger of daytime fatigue.
148
Bats sleep 18-20 hours per day.
5
Honeybees never sleep.
276
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33