Insomnia and sleep-deprivation can take their toll on a person. Not only will people feel tired but they can be less focused and even slip into depression. This is why melatonin is important. Both a natural supplement and a hormone made by the pineal gland, melatonin helps regulate a person’s sleep cycle. This is a chance to really work out a consistent and regular sleep and wake cycle. Sometimes the body does not make enough melatonin or lack of light can call seasonal affective disorder (SAD). Thus melatonin and sleep go hand in hand.