People Who Get Less REM Sleep May Be at Greater Risk of Dementia

People Who Get Less REM Sleep May Be at Greater Risk of Dementia

Consider it another strike against not getting enough sleep: A new study finds that getting too little REM sleep may be linked to a higher risk of dementia later in life. REM, or "rapid eye movement," sleep is one of four sleep stages, which also include two stages of light sleep and a stage of deeper sleep called slow-wave sleep. REM sleep is characterized by vivid dreams and high levels of brain activity, similar to the brain's state when its awake. Humans typically cycle through several periods of REM sleep between the other stages of sleep each night. In the...

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