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
Lack of water is the #1 trigger of daytime fatigue.
148
Termites work 24 hours per day and they do not sleep.
57
The human brain is more active during sleep than during the day.
28
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
Those who get out of bed by 7am are more likely to be thinner and happier.
20
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212