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.
1 A drop in body temperature aids sound sleep. So time your exercise five to six hours before bedtime.  Make your exercise vigorous enough to make you sweat a little. Previous studies have shown that non-aerobic stretching and concentration exercises alone did not impart sleep.