Chronic cerebrospinal venous insufficiency "describes a theory in which portions of the venous system (the body's network of large and small veins) in the head and neck are narrowed or blocked and therefore unable to efficiently remove blood from the brain and spinal cord (central nervous system)" according to the MS society. This blockage causes build up of blood in the central nervous system. As the larger veins are blocked, blood now travels through weaker vessels, allowing leakage into the surrounding tissues. Deposits of iron from the blood to the central nervous system can promote immune responses associated with Multiple Sclerosis.
Studies in CCSVI indicate that your body position when sleeping can affect this process. Studie,s using catheters to test blood flow during sleep, show that sleeping on your stomach can cause the environment of blood build up and back flow. When stomach sleeping the head moves to the side. Head position at 45 degrees lessens the blood flow of the jugular significantly. A 90 degree head position can cut off jugular flow entirely, often causing headache, dizziness, or vertigo.
Read more about CCSVI at the MS society, or about its interactions with MS through facebook!