S.D.
I would go with the lay down and sleep. If you wake up because of them, then head to the hospital. Of if you wake in the morning, and are still having them regularly then head to the hospital as well. My doctor has told me they would rather see me end up in the hospital and send me home, than me not go in and have something happen. So if it really concerns you then go up there.
If it is labor, you will want some rest. I had to have both my kids induced and was at the hosptial the night before. Both times, they gave me drugs so I would sleep, and it made a huge difference. My son came quickly after starting pitocin, so i felt good getting that sleep. My daughter, came 2 days after I went into the hospital, and I was up all night with intense labor, and since i didn't sleep that night, it made a huge difference with all the pain, and how everything went. So get some sleep, and good luck.