Question

During the winter, production of what amine involved in the sleep-wake cycle may be affected by less sunlight hours?

Answer 1

melatonin

What does sunshine have to do with sleep  other than the sun shining in your eyes and waking you up ? For many people, sleeping problems have to do with an amine that the brain makes called melatonin. This compound affects the sleep-wake cycle and is affected by sunlight. During the winter, the daily cycle of melatonin production may be affected by less sunlight hours. If this cycle is changed, the person may have trouble sleeping. Melatonin supplements are available in pharmacies and health food stores and may be of help for those with sleeping problems.