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.
Concurrent use of sumatriptan and buspirone can increase the risk of serotonin syndrome. See 'Serotonin syndrome' and 'Monoamine-oxidase inhibitor' under Antidepressant drugs for more information and for specific advice on avoiding monoamine-oxidase inhibitors during and after administration of other serotonergic drugs.