Scary "dream" i had

I slept around 3:00 or 4:00 because i was talking to a friend of mine really late and after i fell asleep like maybe a couple minutes later i opened my eyes and saw something next to me it genuinely scared me and i screamed and got up but once i turned on the lights there was nothing  i was shaken up and decided to stay up some more to watch youtube and then my mom got home and my dad had told my mom i was screaming which was embarrassing