This morning I put Jack down for a nap and started vacuuming my bedroom (Ah, yes, my exciting life!)
I noticed that he was being really quiet after only fussing for 2-3 minutes and took a look at the monitor. He was laying back with his arms behind his head and his legs up on the bars of the crib and I thought,
"Oh, he's looking at the seahorse, how cute."
Then I realized that he was not moving at all and then.... I realized he was sleeping like that.