Has anyone with a steady LD rate (say at least 2/week) seriously tried CAT? I'm wondering about the effectiveness of CAT vs. WBTB. WBTB seems more flexible as you can do it whenever, and CAT seems to require sticking to a very rigorous sleep schedule which is not always possible unless you're a hermit . But the idea of CAT, that your body "naturally" starts to wake up at the earlier wake up time on the "sleep long" days seems interesting.