A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Termites work 24 hours per day and they do not sleep.
57
The strangers in your dreams are actually people that you've seen in real life.
50
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193