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all probability this is Neck
stiffness due to wrong sleepin
g posture. Other than that it can be occipital neuralgia which results from compression of higher cervical vertebral nerves. It can also be due to an in
flamed carotid artery or jugular vein
It is difficult to comment beyond this at this stage without examinin
g. Please consult your PCP for primary examin
ation followed by proper in
vestigations and referral. Hope this helps. Take care!