Whoa there is a serious design error with the new Macbook's and you need to take note of this one so that you dont have a issue. I guess its a default setting that you need to change. Hey I may be a pc girl but I would hate to see anyone's computer have a issue like this one. Check this story out on wired:

MacBook Users: Turn off This Bluetooth Default Setting Now

Last night I discovered an incredibly dumb — and what I consider to be dangerous — setting enabled by default in my unibody MacBook Pro. In the Bluetooth preferences, it's the box checkmarked "Allow Bluetooth devices to wake this computer.” Sounds innocent enough, but it could've killed my computer.

Here's what happened: I was in a rush to leave the office to meet a colleague for coffee, so I closed my MacBook Pro and threw my Bluetooth mouse into my laptop bag. After my coffee meeting, I ended up at a bar and took my notebook out to quickly check my e-mail. It was scalding hot all over, and when I opened the lid I was greeted with the gray screen of death. And I realized my notebook, though closed, was still on for hours — the heat insulated by my bag.

There is a forum on apple about this issue that you can read HERE

If you know anyone with a Macbook you may want to message them and have them read this like ASAP.