Sounds like you have some environmental barriers to a good night's sleep (the noisy upstairs neighbors) as well as stress from your long commute to your work center (sounds like the U.S. equivalent of Workforce Centers or Temp Agencies).

First, complain to your landlord about your upstairs noisy neighbors. Hopefully they will be more considerate. If not, invest your money in some well-functioning ear plugs. Or...if you can afford to do it, move out to another apartment at another location.

Then, work on lowing your stress (cortisol) levels. Walk every day even if its just for ten minutes. Do something every day at the same time that relaxes you.

Also, stop eating dinner at least 3 hours before bedtime. No snacks, no alcohol, just decaf tea and water. This will make it easier for you to sleep (no acid reflux when you lay on your side, and no food for your body to work hard to digest which is what will keep you awake).

Force yourself to go to bed at the same time every night. Create a routine and follow it. Wake up at the same time every morning, even if you have a different schedule of what you're doing every day. You have to train your body clock to get drowsy and to wake up.

If you need a sleep aid, try Melatonin or Magnesium. Stay away from actual sleeping pills because those will prevent you from getting deep sleep; studies have shown that sleeping pills disrupt the body's sleep cycle - stage 3-4 sleep which is Delta sleep, the deepest sleep right before R.E.M. sleep which is the last stage where you dream right before you wake up.

It took me 3 weeks to retrain my body clock to fall asleep. I accidentally broke my sleep cycle last night, staying out late. Now, I will need another 4 or 5 days to reset it again. Having screwed up my sleep cycle a LOT over the years, I know that now it takes my body naturally about 5 days before it will reset again.

Hope you can figure out a safe way to get back to sleep again.