As someone who has for years I was rather interested in an article I read a couple or weeks ago.
It stated that if you have a mains powered clock, or any mains powered appliance, adjacent to your head (actually within 4 feet) then the EMF from it can interfere with your brain waves and prevent restful sleep.
It seemed a bit far fetched but I moved my clock away from the head of the bed (it was about 2 foot from my head) and have found I do now sleep a lot better.
Worth a try if you wake up feeling more tired than when you went to bed as I used to do.