Officially named lagophthalmogic somnambulism, open-eyed sleepwalking is a condition in which a person is awake, but appears so exhausted and worn out that they may very well just be sleepwalking with their eyes open.
John: What’s wrong with Richard?
Sam: He’s open-eyed sleepwalking. He had to stay up all last night working on some ASL assignments.
John: Poor guy…
Heather laughed as she told her friends about seeing a guy she had a crush on, and had a hard-on while passed out, and how she enjoyed sleepsacking him.