Can you explain your problem in more detail? Do you fall asleep late in the night and then feel tired all day, and then it repeats over several days? If you miss a whole night's sleep, surely the next evening you're so exhausted you fall asleep easily?

I have found that I sleep much much better with a total absence of noise and light, so I now use ear plugs and an eye mask. This has improved the quality of my sleep a lot.

Also, we all have a cycle that lasts approx. 90 minutes; you will fall asleep more easily at the end of that cycle; the time window is around 10 minutes. You need to be prepared to go to bed when that window starts; if you start preparing to go to bed when you feel sleepy, by the time you're in bed the moment's passed and you need to wait another 90 minutes.