There is no universal definition, unfortunately, but there are many European countries. The idea is if you stay awake for two or more hours between 10pm and 5am and you are engaged in some activity,. You are not lying in bed and wondering worrying about something but actually working. Even if you do it once a week for 50 weeks, that itself is enough to disrupt your physiology and metabolism, behavior, brain function like a shift worker.

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