What could this mean?
Yesterday night I was at a sleepover with some of my mates I was the last girl awake with my best mates older brother and my friends boyfriend, I was laying on the sofa with ym PJ's on and a duvet over me and I was watching the two boys play football on the PS3 and I was dozzing off. Then I looked over to the boys who are sitting on the other sofa and I caught my bet mates brother looking at me.Then he quickly turned back, I was looking over at him a few times but it didn't notice because I just moved my eyes (I caught him doing it a few times before we all went to sleep )B4 that happened the brothers mate took the place where I was and the brother kept telling him to get ou of my bed.During the night when I was awake with the guys the boyfriend kept asking if I wanted to swap with him so I would be next to the brother as joke and I said no following the joke on. I av talked to his sis my best mate about it, she gets really happy and excited and won't tell me why. Lol.
What do you all think?

MY MATE IS HIS YOUGER SISTER!

Maybe he's got a crush? Start talking to him more. See how he acts then.

It means perhaps you should not be doing sleep over with boys in the house

Go for him! What's better than having a best friend who can keep an eye on your boyfriend without you having to worry about your friend stealing him?

If you go for him, approach with caution. If or when you guys break up (assuming he does like you and you guys get together) it could be awkward with your best friend

And also it never hurt to just talk to him.. and meeting a new friend guy ?