Sorry to hear you are having so much trouble quitting C12 ?
Are you drinking lots of water and fruit juice to help blood sugar levels? Those may help with the sleep disorder but, sleep pattern interruption is pretty common for many while quitting.
Are you quitting cold turkey or are you using NRT products?
Reading all you can about nicotine addiction to understand how it affects your brain and your body is crucial to forming a long lasting quit. There's a ton of Joel videos here too that will address specific situations that may be of interest to you. Use this information as best you can - it will help!
I hope you can find a way to stick with it this time Christine because you deserve to be free of this horrible addiction. Know that it IS possible for you as it is for anyone truly wanting it.