You probably know this but for you or anybody else -
https://www.webmd.com/diet/sleep-and-weight-loss#1
"Too little sleep triggers a cortisol spike. This stress hormone signals your body to conserve energy to fuel your waking hours.
Translation: You’re more apt to hang on to fat.
Researchers found that when dieters cut back on sleep over a 14-day period, the amount of weight they lost from fat dropped by 55%, even though their calories stayed equal. They felt hungrier and less satisfied after meals, and their energy was zapped.
Sleep deprivation makes you “metabolically groggy," University of Chicago researchers say. Within just 4 days of insufficient ZZZs, your body’s ability to process insulin -- a hormone needed to change sugar, starches, and other food into energy -- goes awry. Insulin sensitivity, the researchers found, dropped by more than 30%."
@Otis - you may want to shoot for 12-14 hours