Deep sleep and REM sleep impacted? For how long?

Hi! I started Strattera (atomoxetine) 18 mg three weeks ago 8/9. I bumped up to 40 mg this last week. I wear an Oura ring, trying to track my cycles, because I had a hysterectomy years ago - and am in perimenopause. Anyway, one of the things that I noticed off the bat was that my level of deep sleep and REM sleep have decreased since starting the medication. I have been trying not to obsess about it, since most meds have side effects right off the bat. But I suspect I'll have to bump up to 60 or 80 mg after this, and I wonder how long I might go without deep sleep? I think we get less of it as it is, having ADHD and sometimes Autism concurently. I worry about my brain, and all the things. If you have noticed this as a side effect (because you are a weirdo health hacker like me...health anxiety or special interest? We will never know) has it gotten better over time? I'm antsy, but I low key have been feeling pretty low energy, lower motivation, and just overall crappy since I started this med. I'm willing to wait it out to see if it gets better. One additional note: I went off Wellbutrin/Vyvanse around the same time that I started Strattera, so that variable kind of makes it more difficult to know whether sleep and mood have been impacted by one or the other or both.