Sleep is critical for physical and mental health, and our quality of life.
While 3% of the population are genetically programmed to function with less than six hours sleep regularly, the rest of us need around 7.5 hours a night. But what determines whether we like to go to bed early or late?
from Olivia W’s Blog Rss http://www.stuff.co.nz/life-style/well-good/85472274/What-determines-whether-we-re-night-owls-or-morning-larks
from
http://oliviawhinham79.tumblr.com/post/151999262626
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