Читать книгу Dental Management of Sleep Disorders - Ronald Attanasio - Страница 29

This is the stage that transitions from wakefulness and REM to NREM. Typically, it comprises about 5% of the total sleep time. It is considered as a state of drowsiness or light sleep. This stage reflects a change in brain wave activity from rhythmic alpha waves to mixed‐frequency waves, as the individual passes from wakefulness to the initiation of sleep.