It's so hard isn't it not having any idea when you will actually go into labour - it forces you to think about all the possible things that may happen/need to be organised etc etc.
I had ds4 3.5 weeks ago, all my labours have been very short I was slightly obsessing about what would happen when I went into labour (also have ds1-16, ds2-14 and ds3-2.5) but told myself I have not control over what will happen and will just have to deal with it when it does.
I had a homebirth, I had strong feelings that he would be born on a certain date and at night, sure enough he was born on the date I thought and at 02.20!
Ds1&2 were actually out for the night, I was more worried about them waking up and being completely freaked out - the very idea of the baby being born in the living room was gross apparently!
Ds3 stayed asleep til 8 that morning and was most bemused to find a baby in mummys bed...
My homebirth was fantastic, labour was 20 mins start to finish, only about 7 contractions, pushing on all of them and not that painful. Ds4 was delivered by his daddy just as the paramedic arrived, midwives got there 20 mins later! I am v lucky.
I'd say just go with the flow, it will work out and if it happens at night and your dc's usually sleep through then they prob won't wake. Ds3 slept through the ambulance car, ambulance, and midwivesx2 all arriving separately.
I found I had great care (for the limited time I needed them on the night!) and better postnatal care, all the midwives knew me even though I saw several of them, as they all felt a bit more involved with it being a homebirth.
Wishing you all the luck in the world, am very would love to do it all again!