Two articles on sleep. One a warning and the other a how to...
First, get to bed at a decent hour:
An article at WebMD says:
Late Bedtimes Linked to Heart Disease- Men who Turn In After Midnight Show Early Signs of Atherosclerosis
And the folks over at Dumblittleman (no relation) have some suggestions for getting and keeping the 'ole log sawing factory in shape:
Getting Better Sleep – The Google Method