neck have some curve to bear head.if this curve changes its shape , the weight of head may damage other part of body. it is possible to cure the curve`s shape by 1 to 6 month practices. for example this is normal curve of neck:

if you sleep habit is bad ,the shape of curves of spinal may change.
the good sleep form , can cure the bad formed spinal curves shape around neck.

walking can cure backach .