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第24页

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 Blue light from phone screens stops your body from making enough melatonin. Exciting games make your heart beat fast. So stop doing that before bedtime.

 Running makes your body excited. This makes it hard to fall asleep and rest well. Don't exercise right before sleep.

 TV screens make blue light too! So sleep in a dark，quiet room without any screen.

 Warm milk is a good drink before sleep. Reading helps relax，and there's no blue light from books!