Problems with Ohropax?

Does anybody of you have had problems with earplux from wax? I tried this some days now for getting more calm during sleep, but the result where a big dizziness and deteriorization of coordination. Finally i also got an imbalance during lying in bed. Not fine. Are the foam plugs better`? It must be some problem with the inner ear, or some brain functions disturbed by the occlusion of the ears.