Leave macbook on or turn it off when not using it?

any one please can you tell me is it better to leave my macbook on when not using it as I heard that it does some important updates at night time? or is it better to just turn it off and then reboot it when next going to use it. I use it pretty much every day and leave it on charge which is also my second question would it be better to leave my mac on charge but I have noticed the power adapter which is not on the extention cable but just on the small plug from the socket to the power cable

As to your second question, leave it plugged in most of the time if you can. Use it off AC power occasionally and calibrate once a month or so.
http://docs.info.apple.com/article.html?path=Mac/10.6/en/9036.html

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