A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
The average cat sleeps about 2/3 of the day.
203
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
The strangers in your dreams are actually people that you've seen in real life.
50
Lack of water is the #1 trigger of daytime fatigue.
148