Top Definition
The act of waking (usu. in an ambien induced state of mind) in the middle of the night and posting comments on your friends' Facebook pages that you don't remember in the morning.
I think I was sleep-stalking last night--I "liked" a bunch of photos on my ex's Facebook page!
by muh-drees February 13, 2013
The act of appearing outside an ex's home at night in pajamas, loudly proclaiming love and adoration, and, if rejected, pretending to wake up with no idea of why you are there.
Ex: "What are you doing? Go home!"
You: (Pretending to wake) "What? Oh, sorry, I must've been sleepstalking again."
by Inane Alaina October 24, 2012

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