A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "morning".
11
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
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
The average person falls asleep in seven minutes.
115
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193