Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
Lack of water is the #1 trigger of daytime fatigue.
148
The human brain is more active during sleep than during the day.
28
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A new baby usually deprives each of it's parents around 350-400 hours of sleep in the first year. That is one entire nights sleep per week, per parent.
194
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12