Bright light in the late evening can delay the sleep period, making it harder to fall asleep at night and harder to get up early in the morning. To fight insomnia, reduce exposure to electronic devices and televisions after 9 p.m. A person who wakes during the night and wants to go back to sleep should resist the temptation to look at a computer, phone, or TV screen. Staring at a bright light will only increase wakefulness. That light rule applies to lamps as well.
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