Several facts about sleep

 1. Humans spend one third (25 years) of their life sleeping.

2. Sleeping less than seven hours each night reduces your life expectancy.

3. It’s impossible to sneeze while sleeping.

4. Most people can survive up to two months without eating, but only eleven days without sleeping.

5. Dysania is the state of having a hard time getting out of bed in the morning.

6. When someone believes that they slept well, even if they didn’t, it improves their performance.

7. Healthy adults need 7-9 hours of sleep.

8. People can take cat naps with their eyes open without even being aware of it.

9. The “natural alarm clock,” which enables some people to wake up more or less when they want to, is caused by a burst of the stress hormone adrenocorticotropin.

10.  Most of what we know about sleep we’ve learned in the past 25 years.

11. Experts say one of the most alluring sleep distractions is the 24-hour accessibility of the Internet.

12. Female brains typically require an extra 20 minutes of sleep to “recover” from additional stresses.

13. Eighteen days, twenty-one hours and forty minutes is the longest someone has gone without sleep. The record was set by Randy Gardner in 1964 as an experiment.

14. If it takes someone less than five minutes to fall asleep, it means they are sleep deprived.

15. British Ministry of Defence researchers have been able to reset soldiers’ body clocks so they can go without sleep for up to 36 hrs.

16. Light rays from an alarm clock is enough to wake up the sleep cycle.

17. It’s impossible to tell if someone is really awake without close medical supervision.

18. Certain types of eye movements during REM (random eye movement) sleep correspond to specific movements in dreams.

19. Some scientists believe that we dream about things worth remembering.

20. Scientists have not been able to explain a 1998 study in which a bright light shone on the backs of humans knees can reset the brain’s sleep-wake clock.