Buffy had no knowledge of time passing, or what any of the civilians, doctors, or nurses were doing while she was unconscious. It probably would have ended up being a very peaceful time for her, just to rest and lose herself in the black oblivion she'd been placed into.
That wasn't the case by a long shot.
In her own mind, Buffy was back at home. Back with Dawn and her mother when she was still alive, back before Sunnydale had become a giant hole in the ground. Back when things were still semi-normal. But something was wrong. She was sitting alone in her living room, and she could no longer hear the voices of her sister and mother as they worked on dinner together in the kitchen.