NREM Sleep
NREM Sleep: Non-REM sleep stages. Consists of three phases: light sleep, medium-depth sleep, and deep sleep. Dreams can occur in these stages but are typically less vivid and shorter.
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REM Sleep
Rapid Eye Movement — the sleep stage characterized by rapid eye movements. The majority of dreams occur during this phase. The brain is highly active while the body experiences temporary paralysis.
Sleep Cycle
A cycle of approximately 90 minutes consisting of NREM and REM stages, repeating 4-6 times per night. REM duration increases with each cycle, and dreams become more vivid.
Lucid Dream
A conscious dream state where the dreamer is aware they are dreaming and can sometimes direct the dream's flow. Studied from ancient Tibetan tradition to modern neuroscience.
Sleep Paralysis
A temporary condition where the body cannot move while consciousness is awake during sleep onset or awakening. May be accompanied by hallucinations and fear. Culturally associated with 'the nightmare' or incubus.
Hypnagogic Imagery
Visual, auditory, or bodily hallucinations experienced during the transition between wakefulness and sleep. Associated with creative ideas and artistic inspiration.
Hypnopompic Imagery
A semi-dream state experienced during the transition from sleep to full wakefulness. The awakening version of hypnagogic imagery; dream remnants blend with reality.