Science today isn't the same as the science 2000 years ago was but some principles remain the same. The human knowledge constantly grows but with more knowledge there comes even more mysteries and unsolved questions, so science is always going forward.
Causes. The most common cause of a cervical herniated nucleus pulposus is gradual degeneration of the disc, attenuation (weakening) of the posterior annulus fibrosis, and subsequent protrusion of the nucleus pulposus into the spinal canal causing compression of the nerve root.
Causes of Hypersomnia. Hypersomnia has many and varied causes, including sleep apnea, narcolepsy, excess weight, drug or alcohol abuse, brain tumor and certain medications. Following is a list of causes or underlying conditions (see also Misdiagnosis of underlying causes of Hypersomnia) that could possibly cause Hypersomnia includes: 1  Sleep deprivation. 2  Clinical depression.  Schizophrenia.