[header] How to host a sleepover with one guest [title] Ask your parents. [step] You need to get permission to invite someone over to spend the night. If you don't get permission, all your planning could be made useless. 
[title] Make sure the person you invite is pretty nice and someone you know reasonably well. [step] You can ask a causal acquaintance or your best friend, as long as they are pretty nice and you know them reasonably well, it's fine.