I have been experiencing the exact same thing.

the last 10 days every few nights Ive been waking up and unable to get back to sleep for a number of hours ...I even started resorting to a heat pack and wandering about the house!

One morning , which was last Saturday I was kind of a bit frustrated and unsure what was going on that I even called my midwife. Just as quick as I spoke with her the BH's settled down.

In my last pregnancy my waters broke first so I knew it was all systems go then!(and that was 10 days early or so)

*sigh* just goes to show every baby is different I guess and it isn't up to us to decide when he/she arrives!