I used to do 15 mins aerobic exercise and found that it was giving me muscle aches, mental tiredness, heart palpitations etc. Then I switched to stretching and doing light weight training and that seemed better. Now I have added in a little walking (I did 30 mins walk the other day). When I do walk I find that I feel OK, but at bedtime I feel too alert to sleep. This morning I didn't drop off to sleep until 2am. I also had a kind of congestion/heaviness in my chest (which seems only to manifest itself at bedtime). The rest of the day I don't feel that chest symptom, and I think my body reacted reasonably well, it just when I try and get to sleep. Any ideas on how to get around this so I can sleep well?