nightmares refer to a form of parasomnia that occurs during REM sleep and is characterized by repeated awakenings with detailed recall of extended and extremely frightening dreams, usually involving threats to survival, security, or self -esteem.

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Nightmare at psychology-glossary.com■■■■■
nightmare: nightmare refers to frightening and anxiety-provoking dream occurring during rapid eye movement . . . Read More
Sleep terrors at psychology-glossary.com■■■■■
sleep terrors: sleep terrors refers to a form of parasomnia that occurs during deep sleep and is characterized . . . Read More
Sleepwalking at psychology-glossary.com■■■■■
sleepwalking: sleepwalking is a form of parasomnia that occurs during deep sleep, in which the individual . . . Read More
Parasomnia at psychology-glossary.com■■■■
parasomnia: parasomnia refers to abnormal behavior such as a nightmare or sleep-walking that occurs during . . . Read More
Sleep terror at psychology-glossary.com■■■■
sleep terror: sleep terror refers to the episode of apparent awakening from sleep which is accompanied . . . Read More
Separation Anxiety Disorder at psychology-glossary.com■■■
Separation Anxiety Disorder: Separation anxiety disorder or SAD refers to a mental health disorder that . . . Read More
Acetycholine at psychology-glossary.com■■■
Acetycholine: Acetycholine refers to a neurotransmitter involved in REM sleep, that plays a role in learning, . . . Read More
Theta rhythms at psychology-glossary.com■■■
Theta rhythms: Theta rhythms refer to brain waves with a frequency of about 6 cycles per second. Humans . . . Read More
Phisostigmine at psychology-glossary.com■■■
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Non-REM dreams at psychology-glossary.com■■■
Non-REM dreams: Non-REM dreams refer to dreams that are more likely to consist of brief, fragmentary . . . Read More