When you dream about someone does that mean they fall asleep thinking of you?

No, everybody fantasizes about the person they find attractive, regardless if they actually know them or not. You're fantasizing about your ideal of them, someone who would reciprocate your feelings and want to be in a relationship with you. Not necessarily. You can be fond of someone, but it doesn't mean you love them. I have dreamt often about a certain friend to a male I may have met through my husband's business meetings, but it's sure not about love. Sometimes our brains just do strange things. On the other hand if you know this person really well and feel you really like them then yes, you could be falling in love.