Sleeplessness

3 weeks post surgery and although feeling tired in the day but still active, I have at least 2 or 3 nights a week tossing and turning and finding it impossible to sleep.For instance now, it's 1am and I'm writing this!  I've tried all the usual reading, relaxing. herbal tea etc Does anyone else have this problem and are sleeping tablets the answer? Don't really want to overload myself with more medication as I'm on antibiotics for infection. It would help if I could forget about having breast cancer but that's not going to happen! 
Silver