The presence of sleep spindles and K complexes are the defining characteristics of:

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Sleep spindles and K complexes are most commonly found in stage 2 NREM sleep. NREM stands for Non-Rapid Eye Movement sleep, and is divided into stages 1-4. Stage 3 and 4 are also known as slow wave sleep, characterized by deep sleep and slow brain waves, while stage 1 is a transition stage from wakefulness to sleep. REM (Rapid Eye Movement) sleep is a separate stage characterized by rapid eye movements, vivid dreams, and muscle paralysis. Narcolepsy is a sleep disorder characterized by excessive daytime sleepiness, sleep attacks, and sometimes cataplexy (sudden muscle weakness during emotion). REM sleep behavior disorder is a parasomnia where the muscle paralysis typically present during REM sleep is absent, and people act out their dream content.

The Presence of Sleep Spindles and K Complexes Are the Defining