Time release melatonin works great for me.
Another idea, recall seeing this the other day.
"Why sleepiness is not always caused by a lack of sleep"
From the article:
"However, could there be a link between blood sugar imbalance and poor sleep? The answer to that question in my view is an unequivocal ?yes?.
One of the effects of low blood sugar is to cause the body to attempt to top up blood sugar levels internally, through the release of sugar from the liver. To do this, the body can ramp up activity in the so-called ?sympathetic nervous system?, which plays an integral part in the stress response. The body can also release stress hormones such as adrenaline (epinephrine) that simulate sugar release too.
An activated stress response ain?t so good for sleep. At the very best it will impair the depth of sleep and our ability to feel truly rested. Worse than that, though, is its habit of waking people up at about 3.30 ? 4.00 am and then not letting them get back to sleep again until about half an hour before their alarm goes off.
I?ve found in practice that rectifying blood sugar imbalance with a ?primal?, relatively low-carb diet does wonders for improving energy and mood. And within a couple of weeks, it will have usually sorted out any craving for the carbohydrate-rich foods that usually are the cause of the problem in the first place."