[Sleep, for skeletons, is largely cosmetic. Enjoyed (by him, anyway), but not strictly necessary. So when Asriel speaks, it's more than enough to pull Sans' eye sockets back open to look for the source.
... He kinda wishes he'd stayed asleep.]
Kid? [He asks, already looking more on edge than is close to normal. It's hard not to. He just looked so much like his mom, not to mention the fact that he was clearly hurt.] What the hel-heck. What happened to you?
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... He kinda wishes he'd stayed asleep.]
Kid? [He asks, already looking more on edge than is close to normal. It's hard not to. He just looked so much like his mom, not to mention the fact that he was clearly hurt.] What the hel-heck. What happened to you?