Sleep spindle

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Sleep spindles are bursts of neural oscillatory activity that are generated by interplay of the thalamic reticular nucleus (TRN) and other thalamic nuclei during stage 2 NREM sleep in a frequency range of ~11 to 16 Hz (usually 12–14 Hz) with a duration of 0.5 seconds or greater (usually 0.5–1.5 seconds).

Excerpt from the Wikipedia article “Sleep spindle”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Stage2sleep.svg: User:Neocadre. Original uploader was Ijustam at en.wikipedia derivative work: Neocadre (talk), Public domain, via Wikimedia Commons.