I saw a movie about a kid who woke up and found a sandman or boogeyman and befriended him... it's kind of hazy but the last scene they are on the playground and he's yelling at the sandman and finds out it's not his "friend" but another sandman that kills him...

Sounds like,.

The Twilight Zone (85)
Episode:The Shadow Man

THANK YOU! I remembered the final scene and could not remember much else. I was 10 when I watched it so it's been awhile. Thanks again!