Sounds like you are sending him the signal that you want to do something with him in the bed.
He's your brother. If nothing has happened, nothing is going to happen. So what if something does happen as long as you both want it ?
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Well, it depends on your gender. If you're a boy, then no, it is definitely NOT normal for you to sleep naked next to your sister. But if you're a girl then I guess it's normal enough, I mean your both girls so neither of you would mind.
If you both are OK with it then its OK