My sleep schedule is similarly fucked, if I don't have an obligation to wake up before noon (say for classes) I will stay up til 5-10am and sleep til 4-8pm, like I'm doing now lol. I agree that it sucks but my body doesn't seem to have the same 'natural' rhythm as everyone else because I automagically switch to backwards if I have even a slight chance to. When I have to revert I usually do what others have suggested, stay up until a normal sleeping time (which sucks).
As far as getting tired enough to actually go to sleep, watching some really boring shit on TV will put me to sleep faster than anything. But if you can't sleep with any noise I guess that would be a problem (I can sleep on the floor in the middle of a bright crowded room so I'm not very helpful when it comes to that kind of stuff). My roommate is a little bit like you where she cannot sleep with any light or noise, she uses a sleep mask over her eyes which creates the illusion of blackness and sometimes she listens to white noise on headphones. Not sure if those would help you any.
Honestly some people are just more comfortable as night owls and sleeping during the day, day-sleep strangely feels more natural to me.
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