I've heard it's more likely to happen in the middle of the night because your oxytocin levels peak in the early hours of the morning?

With both boys labour started at 4am, with DD I had a "real" contraction at 8pm, but it didn't really start until about 9:30pm, she was so different! My sister had a bub on Saturday and her contractions started in the late afternoon, so there you go

Not long to go now JM!!!