Retrieving "Hypnagogic Hallucinations" from the archives

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1. Non Rapid Eye Movement Sleep

   Linked via "hypnagogic hallucinations"

   Stage N1 (Drowsiness)
   Stage N1 sleep stage, or the transition phase, typically lasts between 1 and 7 minutes and constitutes about 5% of total sleep time. EEG patterns shift from alpha waves$(8–13 \text{ Hz})$ observed during wakefulness to lower-frequency theta waves$(4–7 \text{ Hz})$. During this stage, subjects often report hypnagogic hallucinations, such as the sensation of falling ([hypnic jerks](/entries/…