When you're in the kitchen going around in circles because you can't remember what you were doing there.
I was in the kitchen this morning walking around in circles wondering what the hell I was looking for when the microwave beeped reminding me I was heating up my cup of coffee. My Kitchenheimer's is getting worse!
To surf the web while effectively asleep, or so tired you aren't completely aware of where you're going. As one would sleepwalk.
"I finished studying for the exam, got some hot chocolate and read my email, then proceeded to sleepsurf the net until about 2am."