Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Sleeping on the job is acceptable in Japan. It is viewed as exhaustion from working hard. Some people fake it to look committed to their job.
57
The human brain is more active during sleep than during the day.
28
Termites work 24 hours per day and they do not sleep.
57
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23