Worried: Found my retina MacBook running super-hot after being in my bag for hours

Hi all
Just a bit worried about my new rMBP (2.6GHz, 16GB RAM). I put it to sleep by closing the lid at work, then putting it into a very well insulated padded sleeve, in my bag. I then went to the doctor and came back 2 hours later.
I opened by bag, first I found it strange that my whole bag was really hot! like it had been next to a radiator.
Then I realized it was my MacBook. I opened up the sleeve and it was running full throttle, the fans going like crazy, and the whole thing was so hot I could barely touch it. There was a 'warm' smell, I'm hoping not burning as such, but it had a distinct hot smell to it. Unsurprisingly the screen was blank (it had crashed or something) as the whole thing was clearly suffocating to death. I turned the whole thing off manually and waited for it to cool.
I've got it up and running again, but I'm a bit worried that I've damaged the processor or similar. I've no idea why it woke itself from sleep and why it was running so heavily. I can't imagine it's good for the machine to be running so hot in my bag with no ventilation whatsoever.
I might have to resort to shutting the machine down fully before packing away now, which isn't very convenient, but seeing as there is no sleep LED indicator on the new rMBP, it's not possible to see whether the machine is properly shut down.
Has anyone else experienced this? Is my rMPB defective or might I have damaged my machine?
Thanks
K

sanjampet's advice is entirely correct.
Here's what happens with overheated machines like yours; monitoring can't hurt. Load a free program like iStat to keep track of the health of your fans. Any damage, if any, would be more long-term, resulting from weakened solder. It's impossible to know what might happen with this computer, since it's a first generation MBPr.
My immediate question is this: what caused your machine to switch on at full throttle? If it happened once, there's a good chance it could again.

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