The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
47% of people have a nightmare at least once a month.
186
Bats sleep 18-20 hours per day.
5
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33