Be consistent with your sleeping routine
You need around seven hours of sleep a night. Children need more, and older folks less. Sleeping much more or notably less than seven hours is associated with a shorter lifespan.
Consistency is as important. You need a regular schedule for when you wake up, when you have your first and last meal, when you dim the lights and when you go to bed. If any of these factors shift by two hours over a week, it's an issue.
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