Benign Epileptiform Transients of Sleep (BETS)

a.k.a. Small Sharp Spikes (SSS)

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  • occur in stage 1 or 2 NREM sleep.
  • usually monophasic, occasionally diphasic.
  • temporal with broad field of distribution
  • There is typically no disturbance of the background, although there is sometimes a single aftergoing slow wave.
  • typically less than 50 microvolts, less than 50 milliseconds

clinical significance

normal variant