Melatonin

Melatonin is a natural hormone produced by the pineal gland that induces sleep.


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Melatonin is mainly used to aid with sleep. The hormone causes tiredness by decreasing body temperature. It also helps with staying asleep and is said to increase dreaming. 

It does not have many adverse effects besides "dizziness and headaches" http://www.mayoclinic.com/health/melatonin-side-effects/AN01717.

I sometimes take melatonin pills when I have difficulty sleeping or want an uninterrupted sleep. I have had no problems with it besides feeling drowsy in the morning. A bonus is that the pills are extremely cheap and effective.

Melatonin 5 mg - 120 Tablets - $10-15

Overall, I would say melatonin is a great choice for sleep aid and is an easy way to get a good nights sleep!

(It can also be taken as a liquid)