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Go to bed earlier than usual. Talk with friends after dinner. Stay with friends after dinner. Do some mental work.
unless while until during
you get the habit of staying up late you haven't taken sleeping pills you sleep for hours after dinner you fail to do some exercises
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at least at most at last at first
ability health thinking life
unless while until during
You mustn't take sleeping pills in order to get a good night' s sleep. You should stay up if you want to sleep effectively. Food is necessary at night if you fail to go to sleep. It is very important to get out of the habit of taking a nap after dinner.
ability health thinking life
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you stay up too late you get up too early in the morning you take sleeping pills you wake up too frequently at night
unless while until during