Harvard Health Columns

Nightmares and Other Sleep Disturbances

"Sweet dreams." It's a common way to say goodnight. And pleasant dreams often accompany a good night's sleep. But sleep isn't always sweet. Some people have bizarre behaviors or really bad dreams during sleep. These can lead to accidents or violence. Nightmares may even trigger heart attacks. These experiences are related to a group of disorders calledparasomnias. They are different from insomnia (the inability to fall asleep or maintain a restful sleep) and hypersomnia…

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