Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Termites work 24 hours per day and they do not sleep.
57
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
People who sleep late have more mental stamina and can outperform early risers.
33
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
If you hold farts in during the day, they'll just come out when you sleep.
16