stress can bring out lyme syptoms even more. I just went through a very stressful event a few weeks ago and got very sick as a result. I am feeling better now, but it is impossible to avoid stress in life I have found out.
Can you exercise? It is the best thing I have found for lyme, sleeping issues and stress release. All around a win win if you are well enough.
I am not a big yoga person (I have a 2 year old and no free down time) but yoga is a great way to relax and maybe you can try to do it before bed. When I was really sick with lyme I think I slept about 15 minutes a night. It was awful I remember. I never took anything, but as I got better so did my sleep. Even now so many years later if I my symptoms flare up I have terrible sleep, nightmares and just can't sleep well.
Eventually it will get better, but I would try to exercise if you can. Do it later in the afternoon, but not right before bed. Also maybe taking a hot bath before bed might help.