I found Bedfellows many, many years ago, and have never been able to shake it from my mind. It is about as short as any short film can come, clocking in at just under two and half minutes. But let me warn you right now, that two and a half minutes is ten times scarier and more efectively made than most full length horror films that have come out recently. It was made by a company called Fewdio, and they have an extensive collection of horrifying shorts over on their page that I seriously suggest you check out.
I will openly admit. though. Few can touch on the horror that Bedfellows does. It plays off a fear we all have, and will make you think twice next time you get into bed and your spouse is facing in the other direction.
Short, but scary as well get out.