I have a Tempurpedic mattress and pillow, but still wake up with a stiff neck what's wrong?

I have been working out of town and sleeping in a hotel for the past month, coming home on weekends. I find the Hotel bed comfortable, and my bed wasn’t. So I purchased a tempurpedic mattress as well as pillows yet I am waking up with sore neck this was not happening at Hotel Help!