So long as I get my 20min hardout cycling a day I fall asleep fast and feel good when I wake up. If I don't get the exercise for a day or two I have trouble sleeping and sleep lightly.
I used to have awful trouble sleeping and took antihistamine (the old, sedative variety), which helped me get to sleep, but meant I took a while to wake up.
I prefer the exercise route though, and it's helped my general health. Sometimes I do more than just 20mins fast pedalling, but that's the absolute minimum, and I don't do more than 20mins at a time of the really hard-out stuff now - it just wore me out. I walk a lot too, which seems the ideal form of exercise if you have an hour to kill and the weather is nice - low impact, refreshing, and a good all-round workout - also great for a good night's sleep
