A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The average cat sleeps about 2/3 of the day.
203
The strangers in your dreams are actually people that you've seen in real life.
50
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
Honeybees never sleep.
276
47% of people have a nightmare at least once a month.
186
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193