The body is a marvelous thing... and our brain controls it in ways we can hardly fathom.
I've read reports where folks in a control group in a drug trial, or those taking a placebo, achieve/sustain benefits... sometimes in the 20+ percent range. They shouldn't, there is no medical reason for it, but they do. Or, the study that showed folks with a positive attitude are many times more likely to achieve a good outcome, while pessimists fare far worse. Same treatment, same disease, totally different outcomes based on where their head is at. Or one reads of 'wish fulfillment', or even 'self fulfilling prophecies', and one wonders... is there any limit to what our heads can do to us... either negative/positive.
Perhaps the sleep disruptions is an over-sensitivity. Or perhaps it is partly an adrenaline reaction... you are anticipating ... results.. change.. improvement. Like a kid at Christmas. Or, perhaps, since you've had problems in the past, you are expecting there to be issues. And this is your mind making your prophecy come true. I don't know.
Only way to find out for sure would be to have identical pills, some real, some placebo.
This may sound ludicros, even insensitive. I apologize if it comes across that way.
In training folks to shoot... especially handguns... some would develop a flinch reaction, in anticipation of the sound of the gunshot. To get them past it, in a 6 shot revolver you would put only 3 shells... 1 by itself, then a empty chamber, then 2 side by side. If you spin the cylinder and close it, the person pulling the trigger wouldn't know whether it was over a loaded chamber, or an empty one. Using that method made flinching simply go away. Pardon another gun analogy, its a long shot, but it just might work for this too.