So how can sleep help with weight loss? 

The researchers said: “If sleep is extended over longer periods, weight loss in the form of fat mass would likely increase over time. 

“A few observations suggest that sleepings seven to eight hours per night is associated with greater success in weight loss interventions.”

As for why sleeping more would reduce calorie intake, the researchers explained: “Evidence from laboratory sleep restriction studies suggests that increased hunger, alterations in appetite-regulating hormones, and changes in brain regions related to reward-seeking behaviour are potential mechanisms that promote overeating after sleep restriction.”

Source: Daily Express | Diet