Dream About Seeing Someone In My Room

I was sleeping so nicely until I woke up randomly, and it looked and felt like somebody dashed towards the end of my room and was just standing by the fridge. I literally said “hello” that’s how realistic it was, and it looked like someone was still there so I turned the light on, and no one was there. The following morning I had a dream that an email was sent from my account to two teachers asking for help on the situation, except I didn’t send the email. It also started off addressing them as “hey kiddos” which I would never do, so I had to email them myself apologizing and telling them I wasnt the one who wrote the email