I did a librium detox and I know exactly what you mean about being exhausted and still unable to sleep. I went three days with zero sleep, then I was able to sleep in spurts of a couple hours at a time for a couple days, then my sleeping returned to normal. That feeling is temporary and honestly it's a small price to pay to remove the risk of a seizure or DT's that can leave you crippled or dead. Please talk to a doc. Detoxing, including tapering off (if you're able to do it, which most apparently aren't - I know I wasn't), is not something to take chances with.