re: What is the best over the counter sleep aids?

Try melatonin 30 min before going to sleep. The most effective is the formulation that includes fast and extended release melatonin in one tablet. It's safe to use for a month or so while you work on getting back on track.

Avoid the non-melatonin sleep aids; they are all just antihistamines with many side effects. They can impair your judgement during the morning commute. If you have to use them frequently they cause dry eyes/mouth, constipation, urinary retention, even erectile problems.

Try to identify the cause. Many sleepless folks end up taking a prescription sedative/hypnotic when the problem is just bad habits or an underlying health problem. Avoid TV and looking at phone/tablet 30 minutes before bed. Eat dinner early. Decrease alcohol and caffeine use, increase exercise/sex. Turn off all the lights and turn on some white noise. Try to get into a routine.

If all that plus melatonin doesn't work, get checked by your Dr for other problems. Hopefully you can avoid taking antihistamines or a prescription.