A large study of older women (mean age of 83.5 yrs) has found that those who sleep less than 6 hrs at night walked 3.5% longer than those who slept 6-6.8 hours per night. More disturbed sleep also predicted physical impairment, those with high wake after sleep onset (WASO) walked slower when compared to those with lower WASO scores.

SLEEP: vol 32 (7)-July 2004

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