Is Have a nice dream equivalent with sweet dreams?

"Have a nice dream" and "sweet dreams" are similar phrases used to wish someone a pleasant night’s sleep, but they carry slightly different connotations. "Sweet dreams" is a more common expression, often implying a desire for the person to have enjoyable and comforting dreams. "Have a nice dream" can suggest a more general hope for positive dreaming but is less commonly used. Overall, both convey good intentions for someone's sleep experience.