I'm able to sleep almost immediately basically wherever I lay my head, so I've never really had any problems sleeping. However the most important change I've ever made for sleep quality was how I consume caffeine. Yes, I believe you can fall asleep while totally wired, I can too. The problem is that the sleep quality will be terrible and definitely can contribute to insomnia.

So first, the FDA nailed the appropriate amount of caffeine in a day. Don't consume more than 400mg in a day, and keep track. Too much caffeine with overstimulate you and will contribute to any feelings of anxiety while awake or trying to sleep.

Second, stop consuming caffeine several hours before bed. The biological half life of caffeine is between 6-8 hours, so if you have 400mg at 2pm, you'll still have roughly 200mg in your system at 10pm. That's where your sleep quality will get impacted. My personal rule is that I should space out my consumption over the morning, and stop having any caffeine at all in the afternoon.