Yeah sounds very likely. Maybe devoting more energy towards fixing that situation could be the solution?

Im sorry if it sounds like painfully obvious advice, but the more time your spend looking at the symptoms instead of the main cause, the more fixated you become on sleeping. Knowing you can't sleep, and telling yourself that, very quickly becomes a self-fulfilling prophecy.

Perhaps take up a new hobby? Maybe even one that could make you some money down the line?

Or start writing a dairy? Getting some of your worries formulated without anyone actually seeing them can be of great aid.

Maybe something physical? You mention a physical disability, but is there some sport you could take up? Both for actually using your body, but also just to get out and filling your head with something else then worries.

And of course, Phreak's advice. Contrary to popular belief, "sleeping in" on weekend does you absolutly no good. Your body is hardwired to following the sun. When it rises, you should aswell. And meditaton could indeed but the way to go. If you actually follow through with it and gives it time, that is.

I would say "best of luck", but luck isn't part of this. Determination is. So ehh.. Best of determination.