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last day i put my mac on the whole night for downloading xcode.however today i noticed that it is shutdown in the morning.i used the "last" command to know when it was is showing time 11:00am and a word crash can i know the reason for this there any tool or utility to know the there any log of it stored in mac

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up vote 4 down vote accepted

Use Mac OS X's Console (found in /Applications/Utilities) to monitor your system logs by filtering their contents.
Check first system.log and console.log. Logs display their information in reverse chronological order, scroll down to reach content around 11:00am.

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