Contrary to the general belief that since you get tired you sleep easy, people who work out in the evenings have problems going to sleep. I work out around 7-8 p.m. and that pumped me up enough to keep me up till 1 a.m. or so, got awfully tiring.

I was fine when I worked out in the mornings, enough energy to get through the day, and the right amount of fatigue to fall asleep. But ever since I switched to evening workouts, I started having problems sleeping. Though I was able to compensate for it, partly, with a powernap in the afternoon.

Lack of sleep also means the body doesn't release as much growth hormones, therefore not as good results from your workouts :(

You could try raising your core temp. with warm milk mixed with 1/4th teaspoon turmeric, helps you sleep. Plus ofcourse, if you can wake up early in the mornings, it could help you sleep early at night. This is what I tried and it helped.

I have heard that while alcohol might get you to sleep, it doesn't get you into the deep sleep stages as much, and hence you wake up without feeling too refreshed. I don't know if this is true, I never tried it.

Avoid sleeping pills. Once you are hooked, you are screwed. Read a book on history/religion/philosophy or something. Not a crime thriller.

It is recommended you don't spike yourself with any caffeine or boost yourself with sugar/starchy foods after around 6 p.m. Sugar in the blood makes you hyper-alert. Once the sugar levels fall you start feeling drowsy, hence stopping your sugar intake 3-4 hours before bedtime is a good idea.