I had the same thing with my DD (but wasn't overdue) I went in at 37weeks to get checked out (she was alwas very quiet and I had several scans for next to no movement) she was so active I was on the CTG for 3hrs then they sent me for a walk and to come back and try again as her heart rate was 170-180 and wouldn't come down to baseline and the movements just wouldn't stop. Anyway that was around 9pm and I went into labour the following morning. She was born just over 12hrs later from that night. Hopefully Phoenix is kicking up a storm. Maybe he/she is having a farwell party before exiting.