Hallucination, dream, ghost?

At 3am on Halloween morning he awoke to see a figure by the bed. Still, silent, watching him. He blinked and it was gone. But it’s memory stuck in his mind. A grey haired tall woman. Middle aged, quite slender. He sat up and looked all round the room, but the only noise was the tick of the clock and the hum of the central heating. There was no place to hide in the small single bedroom. Not even any curtains to hide behind, with a telltale shoe sticking out. He doubted anyone could squeeze behind venetian blinds…..

Eventually sleep dragged him down into its arms again. Then when he was settled, the figure pushed through the wall and back next to him again. Eyes staring, never blinking, a look of sadness on her face. Never knowing her grandson till now. Knowing it was his last night on earth. One minute here… Tick… The next.. Gone.