It can take four months of regular aerobic exercise to help insomnia sufferers get a good night's sleep, researchers say. "If you have insomnia you won't exercise yourself into sleep right away," says lead study author Kelly Glazer Baron, a clinical psychologist and director of the behavioral sleep program at Northwestern University Feinberg School of Medicine. "It's a long-term relationship. You have to keep at it and not get discouraged." This is the first long-term study to show aerobic exercise during the day does not result in improved sleep that same night when people have existing sleep problems. Most studies on the daily effects of exercise and sleep have been done with healthy sleepers.
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