Putting the periodicity back into the periodic leg movement index: an alternative data-driven algorithm for the computation of this index during sleep and wakefulness

•High periodic leg movement (PLM) indices were found in people with many leg movements, even in the absence of periodicity.•The Periodicity Index rather than the PLM index is more specific for restless legs syndrome.•An alternative PLM index calculation is proposed that takes into account this perio...

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