Why am i sensitive to sound when i wake up?

Hyperacusis: Hyperacusis - sensitiveness to excess sound. Though this can happen because of a nerve paralysis called facial nerve which supplies a small muscle-stapedius , isolatedly it will not happen withoput other muscles involved. Excess teeth grinding from stress can cause increased tension of a muscle close to ear called tensor tympani, which normally tenses to protect from excess sound, but overacts