So girls can't stay cool in the summer while sleeping because their body is sinful, even if no one sees it? Just the simple KNOWLEDGE that she doesn't have a shirt on seems to have you hyperventilating about the "appropriateness" rather than comfort and the ability to rest. I suppose, if she is tired from lack of sleep, it is also her fault if she doesn't do well on school? Do you think she should have the ability to control her body temperature and sleep is within her control because she is a girl and is "developing" and she is being sexual but don't sexualize boys without a shirt? She's being punished because her body is changing and you cannot handle it without it being perverted. You are the ones with the problem.