Side Effect 9: Insomnia
When melatonin is used occasionally and at the apt time, melatonin can work as wonder in encouraging better quality sleep. However, with prolonged use, melatonin can also amplify insomnia. If you take less dose, it would not produce the desired results whereas more dose can cause side effects, including an interference in the sleep-wake cycle. Therefore, the trick is to take just optimum amount of the supplement that will produce the required effects without compromising on the quality of sleep and the rhythm of sleep-wake cycle.
When there is too much melatonin in the system, the receptors get overwhelmed, thereby altering the way in which body reacts to the hormone, irrespective of its endogenous or exogenous nature producing Insomnia.