The first few rounds of knocking hadn't even woke her, but it brought her out of a deep sleep, so by the third round, she stirred, and her eyes snapped open. Someone was at the door. At this hour, it had better either be Sam, or the person there had better have damn good information. Standing up, Buffy shuffled past her bed, fixing the blanket that she had over Dean as she went, and then headed to her door. She was probably a complete mess, but her apartment was dark, save for a small light in the kitchen, so she didn't care.
Unlocking the door, she pulled it open, flinching back from the light in the hallway. Eyes slightly red, she blinked multiple times and then looked up at Sam, before stepping back to let him into the room. "He's in my room. Don't be loud, he's sedated but I don't want to risk waking him." the pills would probably keep him sleeping through the night, but that wasn't the point.
When he was asleep, he still looked like Dean. When he was away, the blankness behind his eyes was apparent. Sure, he'd still recognize the most important people in his life, he'd probably know who Sam was, call him by his name. But the sanity was gone. At least until she could get it back.
After Sam was in the apartment, she closed and relocked the door. She didn't know why she bothered with locks when everyone here was supposed to be on her side. She just wasn't taking chances anymore. Or maybe it was nice to just have her own space that people couldn't come in and out of whenever they wanted for once in a long time. Buffy made her way through the darkened apartment, back to her room, and quietly stepped inside again, walking over to the edge of the bed where Dean was still out cold.