I write this with huge bags after a night of being up with my youngest five times and a lovely loud wake up from my oldest two at 6 
in a bit of an anxious panic about my fourth in the way!
DD’s are 6 and 18mo (7&a bit over 2 when baby #4 arrives) and DS is 5. I’m only 6 weeks with #4 and it was quite the shock as I was researching about having my tubes tied at the time! But instant happy surprise 
however definitely getting them tied after this! 
One thing I’m really concerned about is sleep. Currently littlest DD is quite good, she works her own routine sometimes where she just won’t nap that day or goes to bed a bit later, occasionally may wake up a couple of times for a quick cuddle and resettle before midnight and if poorly or teething we’ll have a rough week of almost all nighters. Oldest DD and DS can be tough - go to bed fairly well but anywhere between 5am-6am they’re up switching every light on they can upstairs and running around being so loud despite hundreds of conversations about their morning behaviour, even DS’s teacher is helping and advising them about it which is lovely of her, but not working. They’re up, lighting the house up, banging and shouting, stealing food if we forget to lock the kitchen door (somewhat our fault I know) and fighting like cat and dog hurting each other before I’ve had chance to pee. Often wakes littlest DD a lot earlier than she usually gets up if left in peace and gives me hell for the day!
I’m finding it hard because I have PTSD and lack of sleep hugely contributes to my anxiety and I get snappy and irritable and feel crap for being like it. Me and DH own our own company in tree surgery so he doesn’t like to get up at night because he has to work, which I understand but still get so mad at him for because he seems to think I can sleep all day 
So since 4am this morning I’m a bit of a worried mess about the sleep situation when baby #4 arrives. I can’t imagine how anyone will sleep, especially is littlest DD is transitioning to a bed around then with the up and down in and out, the wake ups all night with baby and the early morning and huge racket and fights with the oldest two.
I’m not sure why I’m posting, I think I’m just flapping and hoping to hear some positive success stories so I can trick myself into false optimism for the next few months 