My advice is to find a sleeping drug that works well for you, i've got family who've worked third shift, and they never were completely able to deal with it (even after doing it for 20 years plus). Your sleep cycles will never entirely adjust to working third shift, but after some time it s
In your case, finding a good sleeping drug might be hard. I know your past experences with benzos (are the withdrawl effects of the klonopin finally going away? You mentioned it awhile ago), and given that the most effiective sleeping drugs are types of benzos (Personally, i find prosom the most effective, but it's rarely used anymore). Ambien may be helpful, as it isn't a true benzo, but it's fairly simliar, and you might suffer from some of the same problems.
Many people find benadryl useful as a sleepaid (It's the same thing in tylenol PM or tylenol's simply sleep forumla, so anyone on these can stop buying the brand names in favor of the generics and save a healthy amount of cash, the drug name is Diphenhydramine)
You could try melatonin, but i belive it interacts with benzos, so if you're still on the klonopin, i would definately do some research before taking it.
There are a few other sleep drugs that are useful. Trazadone is an anti-depressant that's known for aiding in sleep and is still sometimes used to aid in that. I also know of a few more exotic sleeping drugs. GHB (Yes, that GHB) exists in a pharmcutical form (I can't remember the brand name at the moment for it) and is an especially effective sleep aid, but getting a doctor to perscribe something like that is going to be pretty difficult. Your doctor would probably tell you to quit your job before handing out something like that.
I'd ultimately reccomend talking to your doctor before going through with anything. None of us here are professionals, and we can't give you the complete advice that one could