six hours before bedtime, based on a study by researchers at Michigan’s Henry Ford Hospital’s Sleep Disorders & Research Center and Wayne State College of Medicine.
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3. Long afternoon napping.
Short naps that are 15 to 20 minutes can help you recharge when you’re exhausted and it’s nowhere near bedtime, but sleep longer than that and you’re in trouble. Try to stop napping if it’s causing insomnia, but if you can’t get through the day without a little siesta, make sure that it’s short.
4. Skipping the day’s workout.
It’s easy to skip a workout when your schedule is jam-packed, but exercise is an important part of reducing stress and improving your mood, which helps you sleep. Sketching out just 30 minutes of moderate exercising most days of your week will help, according to a study by Harvard Medical School.
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5. Staring at too much light.
To sleep, you need melatonin — a neurohormone that causes sleep — and to produce it, your brain needs dark. Too much light, especially from staring at a computer or television screen before you go to sleep, can stop you from falling asleep quickly.