According to a Boston University study, getting an extra thirty minutes of sleep each night will cut your risk of diabetes 41%. And ... being well rested lowers cortisol production - this helps prevent osteoporosis. You can't loose with a little extra snooze. (I couldn't resist that!)
Note: Cortisol is a stress hormone. For more info on this topic, tune into an interview with Dr. Ann Louise Gittleman, author, "Hot Times: How to Eat Well, Live Healthy and Feel Sexy During The Change."