What is the physiological process during REM sleep that largely prevents voluntary muscles from moving, thus stopping us from acting out our dreams?
Which theory proposes that dreams are merely the brain's attempt to make sense of random neural activity occurring during sleep, creating a narrative from chaotic signals?
What common dream symbol is often interpreted as representing a feeling of loss of control, insecurity, or being overwhelmed in waking life?
What is the approximate duration of a full sleep cycle, encompassing all NREM stages and a period of REM sleep?
Which neurotransmitter, associated with wakefulness and alertness, is significantly suppressed during REM sleep, contributing to the illogical nature of dreams?
What term describes the unsettling experience of being 'chased' or 'attacked' by a persistent frightening image or scenario in a dream that frequently recurs?
What specific brain wave pattern, resembling waking consciousness, is prominently observed in an EEG during REM sleep, distinguishing it from other sleep stages?
What is the rare sleep disorder where individuals physically act out vivid, often violent dreams due to a failure of the normal muscle paralysis during REM sleep?
Which specific brainstem structure is considered critical for initiating and regulating the muscle paralysis (atonia) during REM sleep?
Which ancient Greek philosopher, breaking from common beliefs of divine intervention, suggested that dreams were merely 'residues of the daily waking activities' and physiological rather than prophetic?