Sleep, Interrupted

I’m exhausted, and so is my wife. We’re sleeping in two-hour chunks. If we had a newborn in the house, I wouldn’t be surprised, but we don’t. Our younger son is 5.5mo. What the heck?

Almost like clockwork, Joel wakes up and cries every two hours. From 10PM to 6AM, that’s four wake-ups a night. My wife and I take turns patting him on the back or butt and turning on the noise machine’s ocean wave setting. He usually falls back to sleep in a couple minutes, but by then the damage is already done. Our sleep has been interrupted. Again.

Any suggestions for getting him to sleep through the night would be greatly appreciazzzzzzzzzzzz…