Wait until you read this: "Oral administration of 1,000 mg a day of melatonin to five adults for 25 to 30 days resulted in drowsiness being noted as an adverse effect. There were no severe and/or irreversible impacts on clinical parameters (blood pressure, heart rate, ECG, serum chemistry, urine analysis) in these people." Source: Nordlund JJ, Lerner AB. The effects of oral melatonin on skin color and on the release of pituitary hormones. J Clin Endocrinol Metab. 1977

As is mine, now. Back in the wild days of 2016 or so advice online said "just go get some melatonin and you'll sleep!" and the bottle said to take 1 or 2 an hour before you want to sleep, so off I went.