I tried Uberman once before. I simply couldn't adapt and kept blowing naps (or not sleeping at all).
I'd like to try it again in the future, but this time I would probably try Everyman since my Zeo sleep-tracking seems to indicate I need at least 2 hours of REM (and preferably another hour of deep sleep) to feel normal. I would also definitely be tracking dual n-back performance and seeing what the Zeo has to say like some others.
My friend and I are starting the Uberman sleep schedule (six 20-minute naps spread evenly throughout each day) tonight. Have other lesswrongians experimented with alternate sleep schedules? Are any of you qualified medical experts who can give input or advice? Success stories and failure stories would both be appreciated, and I'll keep you guys posted on our progress.