The good old days of sleep, that is. If you're like a lot of people you probably used to be able to sleep in or you didn't have quite so many 'to-do's' on your list and you slept more. Maybe you had less on your mind, and nothing could wake you from the deep sleep you easily found each night.
If all that has changed, regular exercise over a long period of time (no quick fixes here) might be the solution.
Check out the article from Shape Magazine which adds yet another reason to get that workout in.