What is the morphology of EEG sleep spindles?

Updated: Oct 09, 2019
  • Author: Roy Sucholeiki, MD; Chief Editor: Selim R Benbadis, MD  more...
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See the list below:

  • Spindles are groups of waves that occur during many sleep stages but especially in stage 2.

  • They have frequencies in the upper levels of alpha or lower levels of beta.

  • Lasting for a second or less, they increase in amplitude initially and then decrease slowly. The waveform resembles a spindle.

  • They usually are symmetric and are most obvious in the parasagittal regions.

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