Good afternoon Dr. From one month, while i sleep i feel sudden shocked in my head and after that i feel whole room is spinning for a few second, i have done XRay cervical spine lateral view by consulting my local Dr. Where the Xray reports says everything is normal just CERVICAL LORDOSIS IS MILDLY REDUCED So,my Dr. doesn't gave any medicine just told me do some regular exercise. But my problem is that while i sleep i feel sudden shocked in my head and feel whole room is spinning it last for few sec but this type of attack of spinning problem goes 2 to 3 times daily now it is increasing day by day. Please tell me what to do? Thank you