My mom just told me this morning that last night, right after she woke up and fell back asleep, she felt that the room was spinning around her really really fast. It's the first time this has happened. Does anyone know what this might be?
EDIT: From what I'm seeing, it's probably vertigo.
I looked up on google and found this so far...
Room spinning when sleeping · Nervous System Disorders and Diseases discussions | Body & Health Conditions center | SteadyHealth.com
I also just realized that we've been in China the last week or two and we've been sweating a LOT. Perhaps it's an electrolyte inbalance?