Hmmmmmm.
Nominated as the freackiest reply ever.
Hypoglycemia can do weird things to your perceptions.
I used to get perception of scale problems when I was younger; normally when I was ill, but not always. For example I'd suddenly get the feeling that my arm, lain across the duvet, was enormous, my hand miles away - but yet I was tiny. Even thinking about it now brings a ghost of that odd feeling back.
I don't know if it's related to what you're talking about; it did always happen in bed, and was a problem with perception of something that's normally "fixed". I've often wondered what caused it.