News for hackers. Stuff that matters.

A comment on Ask HN: What’s your plan in 2019?. Parent comment

Re:Ask HN: What’s your plan in 2019? by sridca on Wednesday December 26, 2018 @09:58AM (#18762425)
Where did this "8 hours" figure come from? I find it funny that people want to get this mysterious 8 hours of sleep while here I'm wanting to sleep less (I routinely get 9-10 hours or even more every night despite drinking coffee 2-3 times).
[ Parent | on HN ]
Re:Ask HN: What’s your plan in 2019? by Strom on Wednesday December 26, 2018 @11:55AM (#18763104)
It's about getting 5 REM-NREM cycles of sleep. [1][2] The exact time varies from person to person and situation to situation, but roughly speaking the cycle takes 90 minutes and 5 * 90 min = 7.5 hours. Add some minutes lying in bed but not yet asleep, and you've got the 8 hours.

--

[1] https://en.wikipedia.org/wiki/Sleep_cycle

[2] http://healthysleep.med.harvard.edu/healthy/science/what/sle...

[ Parent | on HN ]
Re:Ask HN: What’s your plan in 2019? by PerfectElement on Wednesday December 26, 2018 @05:06PM (#18765334)
The book Why We Sleep mentions some experiments comparing the difference between 8 and 7 hours per night. I haven't looked into the actual studies, but the book suggests that 8 hours of sleep opportunity is the ideal for most people.
[ Parent | on HN ]
Re:Ask HN: What’s your plan in 2019? by superasn on Wednesday December 26, 2018 @03:19PM (#18764543)
Yes I think this 8 hour figure actually causes more people to lose sleep more than anything else.
[ Parent | on HN ]