GH - We all know how difficult it is to take advice from someone that we don't consider impartial, no matter how appropriate the advice might be. With your wife's sleeping issues, would she be willing to see her GP? I know my dr always gets into any emotional issues going on, and if you encourage her to tell him/her the whole story (needs alcohol to sleep, battling forms of depression) she might listen better to his/her guidance than yours. I know my doctor has kept a close watch on me since my separation, and a friend of mine just went in to have her thyroid checked and now has some excellent referrals for help for some of her emotional issues. Her parents have been begging her to get help for years, and it wasn't until her doctor (impartial authority figure) told her flat-out that she needs to address it that she took is seriously.
And she has a perfectly valid reason to see a doctor. Sleeplessness is a huge health risk.