As you know, some foal with what appears to be an incomplete milk fill-up. I'd be watching, in case.
Of course, if you just doze off..........
...........yep, she'll likely deliver.
I watch some of the mare stare cams when I'm up and can't sleep. A nice arab had her tail held way up and out......swishing, up, swish......not pacing or such but, occassionally kicking at her belly. Finally I went to bed. Next AM, she's still preggers!! Next day, same. Third day, I look and she has a foal laying with her. So, sometimes the foal is positioning even that close.
One of mine showed almost NO labor. All filled out, it was time, etc. but, the only thing I saw was that she had changed the usual spot she had been standing in the stall. Knew something was up....even tho she had devoured her dinner. Had cam showing on the TV, I'm sitting down to eat dinner, she looked at her side, shifted weight, looked at other side, took two steps into mid stall, layed down and pushed!
I did a double take thinking she had just passed out -- nope, pushing! Ran to barn and foal was 1/2 out. No problems. She always had a "no big deal" foaling....at 295-298 days. That little sweetie is now playing with grandkids -- mine & hers.
Hope she foals for you, I know it is less stressful for US if they just go ahead!