Oh I hear you on this one! My DS did this for (THANKFULLY) a few days in a row. He was clearly tired, clearly needed a nap but flat out refused. I tried everything, ended up for a few days just having quiet time at nap time infront of the tv watching a few Thomas episodes with him. he just laid on my chest drinking his bottle.The first few days he didnt sleep were a nightmare come dinner/bed time, but after 3 days of that I did the quiet time and it worked fantastic. This week he has gone back to day sleeps, so maybe its just a toddler asserting his indepedence stage? Thats what I put it down to anyway, and today he put took himself to his cot and tried to climb in it - go figure!