Not true. It is more important to go to bed at the same time and wake up at the same time everyday. Not everyone needs eight hours. In fact, if I get eight hours sleep I usually feel tired and groggy for the entire day.
Many drugs affect the release, arrest and efficacy of serotonin, including antidepressants, psychedelic hallucinogens, synthetic opiates, dissociatives, drugs for treating migraines, antihistamines, and stimulants such as MDMA.
SAMe increases a brain chemical called serotonin. Some medications for depression also increase the brain chemical serotonin. Taking SAMe along with these medications for depression might increase serotonin too much and cause serious side effects including heart problems, shivering, and anxiety.