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Sleep loss may disrupt the brain's ability to 'unlearn' fear
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crucial role in maintaining mental health. For example, people with insomnia are approximately three times as likely to develop an anxiety disorder compared with those who sleep normally, according to a systematic review of research published in 2019.
Other studies find that people who experience frequent sleep disturbances — a common issue for health workers and military personnel — have a higher risk of PTSD. Not getting enough rapid eye movement (REM) sleep, which is the sleep stage when most dreaming occurs, seems to be a particularly important factor in this increased risk.Sleep in general, and REM sleep in particular, are known to play a vital role in “fear extinction.” This is the process of learning where the stimuli previously.
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