sleep disorders medicine: sleep stage 1 (non-REM stage 1)
A stage of non-REM sleep that occurs at sleep onset or that follows arousal from sleep stages 2, 3, 4, or REM. It consists of a relatively low-voltage EEG with mixed frequency, mainly theta activity and alpha activity of less than 50% of the scoring epoch. It contains EEG vertex waves and slow rolling eye movements; no sleep spindles, K complexes, or REMs. Stage 1 normally represents 4-5% of the major sleep episode.*
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*Reprinted with permission from: Culebras, Antonio Clinical Handbook of Sleep Disorders Hardcover © 1996 Butterworth-Heinemann