I have on occasion joked to friends that I was planning to invent the 40 hour day. The patent rights alone should be worth a fortune :-)
Despite the fact that I don't have nearly the level of time commitments that most people do and seem to need less sleep, it often seems like I am living life at a dead run. The problem is that, like most of us, I want to do too many things and don't always make the best use of my time. Despite this, I suspect my success rate is a fair bit better than most people manage.
Time is a created thing. To say "I don't have time" is to say "I don't want to."
Lao Tzu
Ultimately, it is not so much a question of finding time, but figuring out how you are currently using it, not wasting any of it, and deciding what really matters. This most emphatically does not mean never taking time to relax, but it does mean getting the most out of every moment.