If you are still in highschool you should really be careful of sleepovers; accidents happen all the time and you two may not be ready for pregnancy.

I was careful and the rubber broke and I got pregnant. I really regretted having sex so young, when I did it because it felt so good physically, but I really could not see myself with him when we celebrating our 50th wedding anniversary.

The urge for sex is very strong, but sleepovers are a bad idea for people who are still in school and have no "real job" or enough education to be independent from their parents. Pregnancy can happen to you! STD's can happen to you too, and they stay with you much longer than pregnancy.