I think sleep is unproductive as well, but on the other hand, if I don't get any sleep and am tired all day then I am even LESS productive. So I aim for a solid 7-8 hours of sleep every night. Actually my body is very sensitive when it comes to sleep; any MORE than 8 hours of sleep screws me over just as much as NO sleep does and makes me groggy and headachey all day.





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