You could actually look at the sources before dismissing them as a conspiracy theory. It took less than 2 seconds to click through to the patent, of which the very first claim is:

- 1. A method of reducing the period before the onset of sleep in an individual comprising administering to the individual a single dose of melatonin of less than 1 mg, said single dose effective to raise the peak plasma level of melatonin in the individual to within physiological nocturnal levels of normal untreated individuals.

And that patent was granted.