My 21 month old is going through a gnarly regression. We’ve tried everything under the sun, sleeping on an air mattress in the room with him, letting his sleep in our bed, rocking to sleep, rubbing his back, in and out of the room, night lights, soft music, white noise, and I’m desperately trying CIO. Nothing is working. He wakes up on the hour and will cry on forever. My husband and I are at a loss. He’s becoming crabby from loosing sleep and starting to hit children younger than he is (not normal for him) at daycare. Anyone have any advice on what I can try to do or keep doing that worked for them? It’s starting to interfere with both of our work schedules. I’m pregnant with baby #2 and the lack of sleep is killer.