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.
Several drugs, methysergide, cyproheptadine, pizotifen and oxetorone having antagonist properties of serotonin receptors have been used for several years in the preventive treatment of migraine. They inhibit various types of serotonin receptors, in particular 5-HT2, and are generally antihistamines and sedatives.