Hypnagogic Hallucinations: These are vivid sensory experiences that occur during the transition from wakefulness to sleep, often accompanying sleep paralysis.
Rapid Eye Movement (REM) Sleep: REM sleep is a stage of sleep characterized by rapid eye movements, increased brain activity, and dreaming. Sleep paralysis tends to happen during REM sleep.
Nightmare Disorder: This refers to recurrent nightmares that cause significant distress or impairment in daily functioning. Sleep paralysis can be associated with intense nightmares.