Baby screaming hysterically in sleep
We got through newborn sleep issues and things were looking up for a while, but once we hit 15 weeks, my baby does this thing where he starts crying and screaming...but he's asleep. And I know this because I go into his room, his eyes are all screwed up, but when I pick him up, he quiets down immediately and is conked out. We settle him, put him back in the bassinet, he sleeps a bit more, and starts crying again 20 minutes later.
Overall, sleep the past week or so has been very broken, so I'm assuming this is the fabled 4 month regression, and I get that we just gotta get through it. But the screaming! Everything I've seen online has recommended to just wait it out, he might be transitioning sleep cycles, don't wake a sleeping baby, but we've waited 5, 10 minutes, he doesn't stop screaming! Last night (now 17 weeks), he screamed himself hoarse, and when I got him to chill out and relax, it was maybe 10 minutes of respite before it started again. In the past, I could get him to quiet by nursing, but that didn't work last night, so I decided to cosleep (safe sleep 7, not looking for opinions on this), and we got 6 blessed hours.
This only happens at night, naps are totally fine so far, but has anyone gone through something similar? I wasn't planning on doing cry it out for sleep training, but also I wasn't planning on doing any training until 6 months. Do I just have to get through this phase? Would love advice.