I generally wake up around 5 a.m. every day. I use to get up at 4, but it tended to irritate my wife and I eventually discovered that I was suffering from the effects of chronic sleep deprivation. My Dad always told me that "early morning is the best time of the day" and I admit to enjoying the peace and calm of the pre-dawn hours. Sitting outside and listening to the world wake up is as good a Zen meditation as you can find.
I also take this time to reflect on my dreams during the night. Not as in trying to interpret them and psychoanalyze myself....I think that's a bunch of BS anyway...but to just replay them in my mind for my own amusement. I've always had very vivid and complex dreams. Even what could be called nightmares are highly entertaining.
Anyway...where I'm going with all this is that I feel sleeping and dreaming are crucial to good health. I would venture to say, even more important than exercise. We need sleep to cleanse and recharge our bodies. We need to dream for the same reason. Good health depends on a good night's sleep. Bad sleeping habits can cause bad health, which in turn hinders a good night's sleep causing further health problems.
Ay, there's the rub!