No way to tell at this point, and yes, it could be sleeping Often you will hear cheeping when they internally pip the membrane, then in the next day they will externally pip the eggshell, then within 24 hours they will zip and hatch. Sounds like your guys haven't gotten to that point yet, so all you can do is optimize their conditions, sit on your hands and wait. Don't open the bator to keep as much heat in as possible.
Think good thoughts and hope for the best. How many eggs do you have and what kind of chickens are they from?