To dream of a sleep over represents awareness that you are doing what you're not supposed to be doing. Noticing yourself being negative. It may be a sign that you are fully aware of your self-pity, jealousy, or that you're breaking a rule. You may be having a problem integrating a new development into your life. Difficulty accepting something,
Alternatively, you may be experiencing insomnia or have been staying up late thinking a lot.
Example: A girl dreamed of having a sleepover with a cheerleader. In real life she was jealous of a friend who had a boyfriend and was moping around the house struggling to be happy for her friend. The sleepover reflect her self-awareness of her jealousy as she sat around bored without her friend. Her difficulty accepting her friend's new life.