The term cervical spondylosis refers to the degenerative disease process which involves the interventricular discs, joints, ligaments and connective tissue of the vertebrae. Associated sleep disorders were reported in several studies. The main task in our study is to assess the changes in the sleep pattern encountered in cervical spondylosis. Forty patients diagnosed clinically and radiologically by MRI as having cervical spondylosis and ten controls were subjected to polysomno-graphy, coloured duplex of vertebrobasilar system. Results: Our results revealed statistically significant difference between patients and control as regards all parameters of polysomnography and hemodynamic parameters of the vertebral artery, being higher in the patients group. Conclusion: Polysomnography is an important tool in detecting sleep disturbance associated with cases of cervical spondylosis especially cervical myelopathy.