This can result in tingling, weakness, spasms, loss of sensation and other such symptoms either on one side of the body or on the whole body. Again this is due to low oxygen supply to
brain where the blood supply to
brain is temporarily cut off generally due to a spasm of the arteries, or a clot or high blood pressure causing micro leaks in the brain.
Ocular migraine, high BP, spasm of carotid artery and brain tumor are the other possibilities.