ADMIN NOTE Here is background from drugs.com about melatonin's safety and adverse effects.   In summary, if you take too high a dose -- we suggest 0.25mg or 0.33mg to start -- you may get headache, dizziness, nausea, drowsiness, or it may not help you sleep. If you are groggy the next day after you take melatonin, you're taking too much. Very rarely, people are allergic to melatonin and should not take it.    Recently, I've found Life Extension 300mcg extended-release melaton