A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Sleeping on the job is acceptable in Japan. It is viewed as exhaustion from working hard. Some people fake it to look committed to their job.
57
47% of people have a nightmare at least once a month.
186