Yes. I experience it quite often too. It's a form of dissociation. Can be either depersonalization (where you don't feel like you really exist) or derealization (where it seems that the world outside of you doesn't exist). Or both.

I wonder sometimes how I get home when I'm in these states and driving. I sit sometimes in bed when I'm depressed and stare at the wall and can't think a single thought, but can't close my eyes. I do it at night when I can't sleep also. It lacks anxiety or feeling or anything.

Dissociation can happen to anyone...those who suffer MI and "normal" people. It can be minor or major. Temporary or long term. I know the term is usually seen as a severe problem, but mine usually only lasts for minutes or hours on particularly bad days. It's not technically a disorder in these cases. It might be part of PTSD or major depression in my case.

You're not alone. I didn't realize how common it was until I read about it in my psychology text last quarter. Most people just dismiss it as absentmindedness.