Rapid eye movement sleep resemblance to waking life), and incorporation of instinctual themes. Sometimes they include elements of the dreamer's recent experience taken directly from episodic memory. By one estimate, 80% of dreams occur during REM. Hobson and McCarley proposed that the PGO waves characteristic of “phasic” REM might supply the visual cortex and forebrain with electrical excitement which amplifies the hallucinatory aspects of dreaming. However, people woken up during sleep do not report significantly more bizarre dreams during phasic REMS, compared to tonic REMS. Another possible relationship between the two phenomena could be that the higher threshold for sensory interruption during REM sleep
Activation-synthesis hypothesis the stages of sleep that show greatly decreased brain activity. There are four different stages of NREM sleep. The brain shows dulled or limited senses of perception, though the thought process has been shown to be logical and perseverative. Episodic movements of the body occur during these stages, though they are involuntary movements. REM sleep is an evolutionarily recent behavior of humans. REM stands for rapid eye movement. It is the deepest sleep a mammal can go into. It is regulated by the pontine brainstem. Infants spend most of their time in REM sleep, and rather than enter stage 1