47% of people have a nightmare at least once a month.
186
You forget 90% of your dreams.
256
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
Those who get out of bed by 7am are more likely to be thinner and happier.
20