If you're waking at 3 or 4 AM, you might be running out of melatonin because you're going to bed too late. Your body may naturally want an 8:30 PM bedtime. Shifting to bed an hour earlier could fix the early wake-ups and boost morning alertness.
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A lot of people wake up at 3 or 4am and can't fall back asleep. Here's probably the reason we can all push on and stay awake more easily than we can just force ourselves to sleep. If you're waking up at 3 or 4am Unless you're drinking too many fluids and that's the reason why chances are you are running out of melatonin. What it means is you stayed up too late and you probably are one of these people that should be going to bed at 8:30 and waking up about 3:30 or 4:00am People don't like that answer because they think no, but I want to be the person that goes to bed at 11. There are ways to shift your circadian rhythm. Try and go to bed one hour earlier and chances are you will wake up feeling better at 3 or 4am now, it's not exactly a solution, but if you're in an argument with your spouse or something about going to bed at one hour or the next, you know you can leverage biology or cite this discussion.