Sleeping breakthrough

Monday night baby C cried for an hour.  AN HOUR.  Before falling asleep.  I breathed a sigh of relief until he woke up 15 minutes later to cry some more.  Sleep training: fail.
Tuesday night baby C cried not at all and slept for 5 hours.  Woke up to eat and went back to sleep with nary a squawk for another 4 hours.  Sleep training: WIN.
How was this miracle achieved you ask?

Wait . . . did you hear that?  That was the sound of all pediatricians everywhere collectively gasping.  Tell you what pediatricians, you come over and spend a few nights with baby C on his back and then we'll see.......

I accidentally discovered this amazing fact of sleep yesterday when C fell asleep on my lap.  I slid him to the couch and he slept for a couple of hours through girls shrieking and playing around him.  He would wake up, put his head up and check things out before dropping it back down and sleeping some more.  IT WAS AWESOME-SAUCE!

Just now I put him down for a nap - fully awake.  Within a few minutes when I went back to check, he's asleep.  I woke him up taking the picture above (the one in his bed).  He merely raised his head, looked around, dropped his head and went back to sleep.  So yeah.  Baby's gonna be sleeping on his belly now.