sleepover with boyfriend?

Sophie
So my mom is very strict. She lets me see my boyfriend but her rule is no sleepovers. It makes me so mad because my boyfriends parents always say the door is open for me to stay over, and my mom won't allow it. Even on New Year's eve she wouldn't let me. I don't know what I can do. I am 16 and tomorrow will be a year with my boyfriend.