Have you made sure that you're cutting out all caffeine before sleeping? It takes 6 hours to flush out caffeine from the body, which is found in not only the obvious, like tea and coffee, but also in fizzy drinks like coke, seven-up etc, tonic water (very, very bad!!), soda water, beer, and sparkling wines and sparkling mineral water. Anything with bubbles can activate the brain instead of allowing it to sleep. Also, chocolate is a sleep depriver too.

If you're taking any of the above within six hours of going to bed, then you'll have sleep problems if you react to them. Most folk don't think about the chocolate biscuit with a cuppa, late on in the day, but that's saying goodbye to sleep! regardless of what stress you are or aren't under.

I stayed awake for four days once, when I was drinking just tonic water (I don't have a sweet tooth). A friend told me of his similar situation when he'd had a tonic water in a 'mixer' drink. He also took four days to figure out what was wrong...and easily diagonosed my problem then. Dropping the caffeine made major difference to the kind of sleep I had too... I felt refreshed, instead of just 'asleep'. So maybe you need to look at your diet as well.
Angelwings.