Substance use disorder occurs when a person needs alcohol or another substance (drug) to function normally. Abruptly stopping the substance leads to withdrawal symptoms. Addiction means that a person has a strong urge to use the substance and cannot stop, even if they want to.
So it is important to maintain positive nitrogen balance in the body while sleeping. When you do and conditions are right so that your rate of protein synthesis exceeds your rate of degradation, and you maintain a positive nitrogen balance, you can grow while you sleep.
Improving sleep will absolutely improve your body composition. A lack of sleep causes an increase in the appetite-stimulating hormone ghrelin and a decrease in leptin, a hormone that helps you feel full and burn fat. Aim for seven to nine hours of sleep each night.