What does it mean when a guy wants to have a sleepover with a girl? [repost]?

We are both 13 but, he is closer to being 14. And, I like him a lot. We were talking and he said we should have a sleepover, and all that. My parents work night shifts, so I would be home alone. So do I let him sleepover, and do you know why he wants to? Thanks a lot ! (: [reposted because I want as many answers as possible] - thanks (: