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Stage 2 Sleep
Stage 2 sleep, or NREM2, is a phase characterized by a state of deep relaxation. During this stage, theta waves are the predominant brain activity, but they are punctuated by two distinct features: sleep spindles, which are brief bursts of high-frequency brain waves, and K-complexes, which are high-amplitude patterns of brain activity.
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Related
Stage 1 Sleep
Stage 2 Sleep
Comparison of Non-REM Sleep Stages
Stage 3 Sleep (Slow-Wave Sleep)
As an individual transitions from a state of relaxed wakefulness into the phases of sleep characterized by the absence of rapid eye movements, what is the general trend observed in their brain wave patterns?
As an individual transitions from a state of quiet wakefulness into the phases of sleep characterized by a lack of rapid eye movements, what is the most accurate description of the general change in their brain wave activity?
Learn After
K complex
Sleep Spindles
Visual Characteristics of Stage 2 Sleep Waveforms
Sleep Stage Analysis
A sleep study participant is in a state of deep relaxation. An electroencephalogram (EEG) shows that their brain is producing theta waves, but these are frequently punctuated by both brief, rapid bursts of high-frequency waves and single, large high-amplitude patterns of activity. Which phase of sleep do these combined features characterize?