It was Spring, and my boyfriend and I were in bed asleep. I wake to the sound of our cat going absolutely ballistic, meowing and yelling at something. Our bedroom door is always open enough for him to come and go as he pleases, and it would not be the first time he woke us up yelling about a rat he caught. I check my phone, and it's 6am. Light enough to see perfectly well, but still with that early morning tinge of dark. A classic early Spring morning. I sat up, to see what my cat was going nuts about, and see my boyfriend, wrapped in my dressing gown (not uncommon), standing by the bedroom door. He had his phone in hand, I could see the light from the screen casting highlights on his face, and was standing as if he had just gone to close the door after walking in. He looked at me, I looked at him. He looked like he had just seen a ghost. Staring at me, in bed, with a look of absolute shock and confusion. I stared back with the same expression as I reached out with my right hand, not dropping eye contact. Sure enough, the still-sleeping form of my boyfriend was right there next to me. Solid as can be, snoring away. The duplicate and I stared at each other, still shocked and confused, for what felt like hours, as he slowly faded away. It was barely 5mins, and I was still trying to shake my actual boyfriend awake, but he was stubbornly moaning in protest and pulling the blankets tighter. Our cat was still meowing and yowing the entire time, first at this apparition, then leaping onto the bed and pointedly yelling at me. Once the mirage-boyfriend faded away, I leapt up to open the bedroom door, and see if I would see him again, but as soon as I tried to step foot on the stairs leading down to our lounge, my cat began biting at my feet and blocking my path. Im not completely daft, so I took the hint and high-tailed it back to bed. Whereupon the cat sat guard on the end of the bed, staring at the door for the next hour or so till our work alarm went off. Boyfriend finally woke up fully, I told him all about it, and the cat finally chilled out. To date, that was the most hard to dismiss event that happened to me. I've seen other weird stuff, but those were easier to shrug off as "just having a moment". This, not so much. It was so clear, and I can't get over the look on not-boyfriend's face. As if I was the apparition to him! Definitely felt like a brush with a parallel universe. Have made a (terrible) Paint sketch of the approx floor-plan, for those curious!