My mom is having a problem, when she sleep usually at night or at afternoon usually during 4pm or 4am, she wakes up feeling terrible. She describes that her right ear starts to make a sound and then suddenly the hearing stops on the right and then she feels dizzy a lot and she starts to droll, not that she drills but she gets the feeling that she's about to droll. This happens and keep happening for at least 30 minutes or sometimes more or less. Then everything gets back to normal. Please help.