There is an “Inception” phenomenon where the individual believes they have awakened and are going about their day as usual (i.e. got dressed, ate breakfast) only to wake up and realize none of it happened in reality. There can be multiple false awakenings in a dream session.
Sign-language users have been known to sign in their sleep.
Babies start dreaming even before they’re born.
Scientists say the higher your I.Q. the more you dream.