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.
Sex increases serotonin levels. OCD, like many anxiety disorders, is marked by low levels of serotonin. Serotonin reuptake inhibitors (SRI's) and /or selective serotonin reuptake inhibitors (SSRI's) also increase the level of serotonin in the brain. Symptoms of OCD can seemingly be alleviated through medication or sex.