He could possibly be in pain, but I'm not sure. I wondered whether going to 4 hour easy was too much for him, as he seems to be vomiting more than he was before which could cause pain, so I've started him on 4hr easy but with 3 hourly feedings, as Tracy describes in one of her interview for when kids are ready for 3 hours of A time with a 5 hr easy but 4 hourly feedings. Also we missed a dose of ranitidine last friday, but his terrible nights started just before that, I've been going dairy free and had some bread with milk powder in it by accident on Thursday morning, and Thursday night was when it all started, so it could be that. I've read that 40% of babies with reflux have dairy allergies.
The last couple of nights he has woken happier, not screaming and arching his back, but still more often than I would like. Last night he woke at 12:30, then 20 mins after he went back to sleep, then 3:30, 5, 5:30, then I woke him at 8 as he was still asleep (as was I!). The other frustrating thing is he won't resettle with DH, he just works himself into a complete state!
Josie30, I've read that babies around 5 months change their sleep cycle and start to wake up fully in between each one, so need to learn to resettle themselves. Lots of my friends have had babies who've woken a lot around this age, so that would make sense. In terms of what we are doing, I looked at Elizabeth Pantley no cry sleep solution and have been following some of her suggestions. We've introduced a comforter which he has taken to brilliantly, I've been tucking it under his arm while I feed him so he would get positive associations with it and now give it to him whenever we want him to sleep. He likes to cover his eyes with its ears (its a rabbit) and suck on its arms. I've also tried to wean him off the bouncing so he doesn't feel like he needs it to go to sleep. We started a sleep mantra (just saying hush, hush, hush, it's sleep time Lachie) that we repeat a few times before he goes off to sleep. We've also started a sleep ritual that I do each time before bed so he gets used to the idea I'm about to put him down. We tried PU/PD but he wouldn't calm down in our arms, so stopped that. He'll calm down by bouncing him, so if he gets upset, I'll say the mantra, and bounce him really gently until he stops crying, then I stop the bouncing straight away. I guess like PU/PD, but the bouncing is our PU part. Since starting all that, I've noticed a marked decrease in his crying time when he goes down or wakes at night.
The other thing I'm doing for my sanity, is going to bed at 8pm myself and getting DH to give him the DF. At least that way I can be assured of a 4 hour stretch of sleep and am not such a zombie in the day time. But fingers crossed he learns soon, I'm going crazy here and don't want to give up my nights for ever!