I apologise that there isn't much drama to my story, but it was strange and I haven't had the time to recount this experience until now. This happened in 2007 when my parents' home was undergoing renovations and I stayed over at night to watch over the place. My dad was ill with cancer at that time so he was not able to. As the home was dusty and dirty due to the work being done, my family was staying at an apartment somewhere else so I was alone at home during this period.
One night I came home after work and went into the small room on the second floor that I was sleeping in (it did not have work done). After watching TV for a while, I fell asleep. Later that night, I awoke to a strange feeling akin to numbness -- I wouldn't call it sleep paralysis as I had a tiny degree of mobility. I felt that the thin mattress (more accurately a small single-sized mattress topper) was floating a couple of inches off the carpet (and I together with it). Although mostly numb, I could move my hand that was hanging off the mattress a little, and took hold of the TV remote that was resting on the carpet right underneath my hand (I fell asleep right after switching off the TV). To confirm my suspicions, I held one end of the remote and swiped it slowly under the mattress. It did its sweep without obstruction -- right under the mattress -- so the mattress was indeed off the carpet.
Strangely, I did not feel fear nor panic, but it took some effort to try to speak... "In the name of Jesus Christ..." I managed to mutter somewhat hoarsely. Immediately the mattress came back down on the carpet. I'm guessing this was some time between 2-5am but I didn't have a watch or clock near me at that time so I can't be sure. If you know me you'd know that I'm a real sleepyhead, so I went back to sleep shortly after. I woke up later the next morning (it was a weekend) with a clear recollection of what happened the night before. The remote was also wedged firmly between the mattress and the carpet (the mattress fell on top of it) with the base of it sticking out.
For the record I rarely remember my dreams, and if I do, they are very fragmented (no details, only broad strokes about what happened) and never for more than a few hours. I've not had any other experience akin to that since.