SLEEP INFLUENCES ON WAKING ABNORMAL MOVEM ENTS

Sleep influences on waking abnormal movements. Sleep decreases conside rably the abnormal movements seen during waking in the degenerative ex tra-pyramidal diseases. However, the electrophysiologic recordings rev eal that muscular contractions are not completely abolished. This decr ease parallels the reduction of the waking system which act likely as a non-specific system of amplification. One can notice that sleep modi fyes the characteristics of the parkinsonian tremor and that some pala tal myoclonias persist during sleep.