The true boundary of sleep is marked by the presence of

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Quizplus · Accepted Answer

Sleep spindles are characteristic brain wave patterns that occur during Stage 2 of sleep. They are considered a defining feature of non-REM sleep and indicate the onset of deeper sleep. Alpha waves are typically associated with wakefulness and relaxation, while beta waves are associated with alertness and activity. A hypnic jerk, also known as a sleep start, is a brief muscle twitch that sometimes occurs as a person is falling asleep, but it is not a definitive marker of the boundary of sleep.

The True Boundary of Sleep Is Marked by the Presence