Your poor sleep hygiene has back-fired. Time to help correct a very confused biological clock system in your body.
First, you need to be in bed between 9:30 and 11pm, depending on when you naturally wake up, and the sleep duration your body normally centers on.
That value, usually 6-9 hours, varies from person to person and also within each of our lives, changing with nutrition status, exercise (cardio encourages healthy sleep patterns), immune health, stress loading, and thru our sleep programming efforts. In other words, there's a feedback system that can mess up sleep quality if you're not careful about getting much needed rest in a regular pattern, same time each night.
Life gets in the way for most of us, and we pay a price for that.
Second, you can use a few supplements to help promote sleep, speed its onset (so you don't take more than a few minutes to fall asleep), and keep us asleep.
Melantonin supplement must be taken no less than 2-3 hours before typical natural production peaks. That means you take it just before bed, 10pm or so. Not at midnight, because it will be counterproductive to your own production, depressing it. 1-3 mg works fine for most, some folk find that using a time released formula is better. More is not better, and can backfire. Some need as much as 6mg, for that it might be best to use the time released format. so that you have sustained release to get you to fall asleep. You want just enough, let me make that crystal clear here.
Two supplements used throughout the afternoon hours can help promote both restful sleep and also production of growth hormone. That would be GABA, and the trick here again is to use just enough, 500mg - 1 gram, not much more than that, in small doses every couple hours.
Theanine is also good for promoting a restful mind and shutting down the cholenergic signal system in brain that makes our minds too busy at nigh - interferes with sleep quality and can cause us wake up repeatedly.
Do not use either one before you exercise in the evening, as it will suck the energy out of strength performance. Use it afterwards, a couple hours before bed.
You shouldn't be working out within 2-3 hours of bed anyway, as it will also interfere with sleep patterns.
Nix the use of caffeine or ECA at night for exercise; works against your GABA and melatonin production.