You forget 90% of your dreams.
256
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Honeybees never sleep.
276
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33