Retrieving "N1 Sleep Stage" from the archives
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Non Rapid Eye Movement Sleep
Linked via "N1 sleep stage"
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/… -
Non Rapid Eye Movement Sleep
Linked via "N1 sleep stage"
| NREM Stage | Primary EEG frequency | Characteristic Feature | Typical Duration Percentage | Metabolic Rate Reduction (vs. Wakefulness) |
| :--- | :--- | :--- | :--- | :--- |
| N1 sleep stage | Theta waves ($4–7 \text{ Hz}$) | Hypnic Jerks | 5% | $2\%$ |
| N2 sleep stage | Mixed, Sleep Spindles ($12–15 \text{ Hz}$) | K-Complexes | 50% | $5\%$ |
| [N3 sleep…