I had bad sleep troubles and still get them occasionally here is some of my advice.
Try giving up coffee(if you drink it)
Caffeine can still have an effect on your body 48 hours later. Try chamomile tea!!! You get used to the taste.
Milk and bananas release seratonin(I think thats correct)a chemical in your brain,which calms you and helps you to sleep.
Avoid taking sleeping tablets long term as it can disturb your deep sleep patterns when you stop taking them.
Last but not least, I don't know what your wife is like but a good romp in the sack always puts me to sleep!!!