According to a recent study published in the respected internal medicine journal JAMA,

Improving and maintaining healthy sleep duration over longer periods of time could be part of obesity prevention and weight loss programs. The study found that prolonged sleep reduced energy intake and resulted in a negative energy balance under real-world conditions in overweight adults who typically reduced their sleep duration.

Ref. Effect of Sleep Extension on Objectively Assessed Energy Intake Among Adults With Overweight in Real-life Settings: A Randomized Clinical Trial | Lifestyle Behaviors | JAMA Internal Medicine | JAMA Network