Mac OS X 10.7.5 cannot shut down

I have a problem with my laptop. I owned a Macbook Pro with a Mac OS X 10.7.5. If I did not shut down (physically switch off) my laptop for over a month in which I just closed the cover (ie. putting it to sleep), it will not shut down.
Do I need to shut down more regularly (say every week once) or I need to shut down everytime after I finished using the laptop (which will be like my old Windows-run system....).
Advice please...
Thanks.

Try reseting the Pram and SMC.
http://support.apple.com/kb/HT1379?viewlocale=en_US&locale=en_US
http://support.apple.com/kb/HT3964

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