I haven't yet been able to fully darken the bedroom yet but it is much darker than it was and I am sleeping better. I have been having trouble sleeping ever since I went off of a prescription medication (Trazodone) that I had taken for sleep for 14 years, and this is the first real improvement I have seen. Some nights, such as last night, I wake up repeatedly in the middle of the night but I just relax and drift off back to sleep. The only thing that keeps me awake is worrying about being awake, so I don't any more.
I have increased my sleep time beyond 8 hours most nights, where it used to be 6-7. That will mean less FIR sauna time, but I am starting to think that avoiding chronic sleep loss is more important. Actually, I thought that before, but reading the book (part of it, anyway) scared me a bit. :) I still have time for at least 4 hours of FIR a week.
My main problem now is to do something about my hips, which have been hurting and waking me up for about 3 months, since fall settled in -- they started acting up this way when we had our first rain of the season. The problem is lifelong and it comes and goes (it seems to be a form of sciatica--I felt the full-blown form of it for a while around the time it started raining, right down my leg). I think that the FIR sauna, along with diet, detox cocktail, etc. is the best thing for it, but see above. :)