A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
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
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Lack of water is the #1 trigger of daytime fatigue.
148
Termites work 24 hours per day and they do not sleep.
57