Retrieving "Hypnic Jerks" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Non Rapid Eye Movement Sleep

   Linked via "hypnic jerks"

   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/…

2. Non Rapid Eye Movement Sleep

   Linked via "Hypnic Jerks"

   | 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…