What is what does it mean when a guy says sweet dreams?

When a guy says "sweet dreams," it is usually an expression of their affection towards the woman. It means that they want her to have a good night's sleep and pleasant dreams filled with love, happiness, and peace. It is a way of showing that they care about her and are thinking about her before going to bed. This phrase is often used as a way of ending a conversation or evening on a positive, loving note. It can also be a sign of romantic interest, indicating that the guy hopes to continue talking and spending time with her in the future.