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Re-activateA single night of partial sleep deprivation slashed the activity level of natural killer cells by a third, a study found. If you sleep less than seven to eight hours a night or feel tired during the day, change your sleep habits by avoiding naps, reserving your bed only for sleep and sex, and limiting your liquid intake for a few hours before bedtime.
Read our recent survey on the nation's sleep habits, and find out why you're not sleeping, and see our Treatment Ratings (subscribers only) for insomnia.
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