Sleep spindles are associated with which state of sleep ?
Stage II
Non-REM sleep is traditionally divided into stages I to IV, each with characteristic EEG patterns. Stage II is marked by two distinctive waveforms: sleep spindles, which are brief bursts of 12 to 14 Hz activity, and K-complexes, which are sharp high-amplitude waves.
Sleep spindles are generated by thalamocortical circuits and are thought to help block external stimulation and support memory consolidation. Their appearance is the standard EEG sign that a sleeper has entered Stage II.
Stage I is a light transitional stage dominated by low-amplitude theta activity and vertex waves, without spindles. Stages III and IV are slow-wave sleep, defined by the presence of high-amplitude delta waves rather than spindles.
Stage II option is correct.
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