A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
44% of kids watch television before they go to sleep.
106
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
The average cat sleeps about 2/3 of the day.
203
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
You forget 90% of your dreams.
256
The human brain is more active during sleep than during the day.
28