the level of activity varies widely from person to person. if you are "moderately" active in your every day life i think it is possible to achieve your "maximum philosophical potential" if you will. little to no activity can definately bring you down on many different levels. if you are healthy, you dont spend any time even thinking about your health, which means more time to philosophize
long periods without sleep can be useful in some cases. generally to keep yourself in good thinking processes you should stick to a normal sleeping pattern.