First sleepover with boyfriend

I'm 17 and so is he, we're seniors in high school and during spring break (which is two months away) we get to have a sleepover for the first time! I'm very excited about it but a little nervous because my parents know about it but won't be home and my younger brother will be. I'm not worried about him telling or anything but I don't want to make him feel awkward, also I'm worried about things like morning breath and my hair in the morning. I have naturally curly hair and it gets frizzy fast after I sleep. He's a really great guy and we've been dating for almost 5 months but I'm still nervous. Also I'm worried about bodily functions such as farting and bowel movements as stupid as that sounds. Any advice would help! Thank you