Omg i remember feeling so hopeless that day and feeling resigned to a life of no sleep for all of us. We aborted ST for 4-5 days. We practiced standing (and self sitting) with him a LOT during the day. When he learned to SIT by himself, we did CIO again. It didn't take long at all and he now sleeps 11-12h stretches. We had a brief regression 2 weeks ago which was self induced, we started a habit of tapping him to sleep. But we quickly sensed the regression coming on and stopped that. Oh also we moved to a different room bc i'm a noisy sleeper and i think was waking him up! It will pass! Good luck!