Physiological movements during sleep in healthy adults across all ages: a video-polysomnographic analysis of non-codified movements reveals sex differences and distinct motor patterns.

Although the differences in MI between age groups did not reach statistical significance as in other studies [ 11 , 18 ], MI is higher in the age groups at the extremes (<39 years and >60 years) potentially reflecting a mechanism of maturation [ 2 , 22 ] and aging-related changes [ 23 , 24 ] of the central inhibitory system.

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