daydream about (someone or something)
To fantasize or imagine scenarios while one is awake (as opposed to dreaming while one is asleep). She's probably daydreaming about the boy she has a crush on, considering she's doodling his name all over her notebook. I can't believe that I'm singing on Broadway tonight—I used to daydream about that all the time when I was a kid!
daydream about someone or something
to have daytime fantasies about someone or something. Poor Alice is always daydreaming about Albert. John is daydreaming about running away to Tahiti.