Importance of sleep

“nidraayaattam sukham duhkham
pushtih kaarsya balaabalam
vrishataa kleebataa jnjaanam
ajnjaanam jeevitam na ca”

This roughly translates as happiness (and sorrow), corpulence (and trimness), strength (and weakness), potency (and impotency), intelligence (or its’ absence) and even itself depends on sleep