I'm not promoting B6 (see the warning at the end) but since we are using both taurine and melatonin, and B6 is critical to both, I thought this might be a good addition to our knowledge bank. Hope someone more knowledgable than am I will jump in here:

Melatonin is a hormone secreted by the pineal gland that aids biorhythm regulation. Biorhythm is disturbed by stress, crossing time zones and changing work shifts. Melatonin production also declines with age. Vitamin B6 aids melatonin metabolism.

Melatonin is a hormone produced in the brain by the pineal gland, from the amino acid tryptophan. The synthesis and release of melatonin are stimulated by darkness and suppressed by light, suggesting the involvement of melatonin in circadian rhythm and regulation of diverse body functions. Levels of melatonin in the blood are highest prior to bedtime. Synthetic melatonin supplements have been used for a variety of medical conditions, most notably for disorders related to sleep. Melatonin possesses antioxidant activity, and many of its proposed therapeutic or preventive uses are based on this property.

Vitamin B6 must be obtained from the diet because humans cannot synthesize it. PLP plays a vital role in the function of approximately 100 enzymes that catalyze essential chemical reactions in the human body. For example, PLP functions as a coenzyme for glycogen phosphorylase, an enzyme that catalyzes the release of glucose from stored glycogen. Much of the PLP in the human body is found in muscle bound to glycogen phosphorylase. PLP is also a coenzyme for reactions used to generate glucose from amino acids, a process known as gluconeogenesis

Melatonin is a neurotransmitter/hormone that is only active during sleep. It is being metabolized when you fall asleep from Serotonin, a neurotransmitter that is being metabolized from the amino acid Tryptophan. Melatonin increases non-REM sleep and makes it easier for you to fall asleep. But it has also an interesting rebound effect that gives more frequent and vivid dreams. The vividness might even give you a lucid dream.

The amino acid Tryptophan can be metabolized into Serotonin and Niacin (B-3). Vitamin B-6 promotes this conversion. Taking Niacin or Nicotine patches will increase the Serotonin production. The more Niacin you take, the more Serotonin is produced and more Melatonin is
metabolized. Calcium and Magnesium promotes Serotonin production as well. Zinc is in every cell of the body and is a part of over 200 enzymes, so Zinc supplements may increase REM-sleep, too.  Large doses of vitamin B6 can cause neurological disorders and numbness. Deficiency of this vitamin can cause mouth and tongue sores, irritability, confusion, and depression. DONT TAKE MORE THAN 1000 MG!!