I have this issue also.
I have had serious problems sleeping for as long as I can recall. I have real trouble getting to sleep but then am so tired the next day that I sleep in and am late for work. My wife will just lie down, close her eyes and she is asleep in 5 minutes. With me, I lie down, close my eyes and my brain decides it wants to bombard me with thoughts, memories and ideas. I will often lie like this for an hour or two and end up just getting up again. When the people in the upstairs flat are having a party or something else noisy it just makes it worse. I have complained numerous times but I think that was reasonable given they were hosting loud parties until 4am on a weekday.
One thing that does seem to help sometimes is listening to calming spoken word. I will often listen to podcasts or audiobooks as I go to sleep and this seems to distract my brain enough to prevent it flooding me with thoughts long enough to get to sleep. Does not always work but best method I have found so far. Oh, also try some of the sleep relaxation vids on youtube - a few of those are quite good.
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AQ46, EQ9, FQ20, SQ50
RAADS-R: 181 (Language: 9, Social: 97, Sensory/Motor: 37, Interests: 36)
Aspie Quiz: AS129, NT80
Alexithymia: 137