The reason is because your body needs to get used to it. Many people have lost some of their neck curve. So when you first sleep or lay on something that puts more curve in the neck it can make you sore.
As a matter of fact, the loss of ones neck curve is the most common spinal misalignment there is. Sometimes it can be seen in ones posture too. If you see forward head posture there's a good chance some of that cervical lordosis is lost.
So, "what should be done to avoid the soreness"?
What one must do, is to gradually work that curve in there. Gradually do some neck traction at a short period of time and for a low intensity. Do a few reps of neck exercises. The same with anything else, do it little-by-little.
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