I have metastatic breast cancer, i.e. stage 4, with metastases to the right lung. Lack of sleep might be a side effect of the meds. My oncologist, as a response to my sleep mention, lectured me on not taking sleeping pills. I felt berated and misunderstood. I've read so much literature about the subject. I have some ideas what I can do, but really resent my doctor for not ever extending the discussion to see what possibilites I have. I feel shut down.