Why does my MacBook Pro shut off when I close it?

When I am done using my MacBook Pro I would usually just shut the lid and the MacBook would then go into sleep mode. In other words later when I pick it up and open it the MacBook screen will light and I can begin using it immediately. However, lately when I shut the lid the MacBook will shut off completely and I will need to push the power button to turn it on again. I am curious as to what may be causing this? Any help or knowledge on this would be greatly appreciated! Thanks.

Reset your SMC, as described here:
http://support.apple.com/kb/HT3964

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