Tart cherries are known to contain melatonin and tryptophan, an essential amino acid (meaning our bodies can't make it) necessary for making melatonin, among many other biologically important molecules. There's some evidence - such as this 2012 study in healthy adults and this 2018 study in older adults with chronic insomnia - that chugging the very sugary juice (an observation from this writer's personal experience) may lull you to sleep.
A deficiency in this mineral is believed to be tied to sleep disorders like insomnia, possibly by disrupting sleep-wake cycles, as some animal studies have found. However, a true magnesium deficiency is pretty rare; many animal and plant sources contain the mineral (even dark chocolate!), so it's hard not to get enough of it if you're eating an otherwise healthy, well-rounded diet.
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