In the movies, sometimes a man and woman are lying in bed together, then the woman wakes up to ask what the man is doing. The man says, "I was just watcing you sleep." Then, all the women watching say that's so romantic.
However, if you break into a woman's house, pull a chair into her bedroom, and watch her sleep, while making a completely unrelated list of ways to murder someone in their sleep; suddenly, it's time for restraining orders and pressed charges.