Hi Nicole, I had chemo first (16 weeks of nab paclotaxol, then 12 weeks FEC). I had my lumpectomy about 3 weeks ago and I'm just waiting to hear when I will be starting radiation. The reason it was done this way was to shrink the tumour enough to have the lumpectomy rather than mastectomy.
As for the sleep I found a warm bath, relaxing music before bed often helped but would often wake about 3am and I'd often just get up rather than tossing and turning because that's when your mind keeps going over things. Better to get up read a book, play candy crush, anything that you can do that doesn't involve too much brain effort. Have to say I found myself ironing at 3am a few times!
Have a look online for relaxation techniques, I find things like lying on your back eyes closed, breathing deeply in and out for a bit, then working slowly up your body telling each part to sleep, slowly working up to your head.