I had a 30hr labour with DD and only about 4hrs sleep before I woke up with the early labour pains and then couldn't sleep anymore. I ended up having a ventouse delivery with an epi. I know subsequent labours are shorter and you're less likely to have an assisted delivery in subsequent births, however only two people that I know of in my family have had any at all, and one of them is adamant they will have no more children as they're so traumatised by their birth (forceps) - the other had a ventouse delivery, and then a forceps the second time!