He Said He Came From 19th Century

Isla was half awake when she look at her roommate, Samuel, in the bed on her right side. She saw her roommate sleeping soundly. But when she blinked Samuel was gone. She was bothered for many days because she was pretty sure that her eyes didn't deceived her. For confirmation, she pretended to be asleep every night. Every 12:00 AM, Samuel, who is in bed "sleeping" would mysteriously disappear. She thought she knew "everything" about him, they are pretty much open to each other. But of course there are still things that he won't tell. Samuel noticed that he was bothered by something so he asked her what happened. Although she was reluctant, she still answered him with the things she witnessed. Samuel cleared his throat and spoke, "you're just hallucinating because of stress." Isla furrowed her eyebrows and answered "ARE YOU GASLIGHTING ME?!"