Macbook Aluminum falls a sleep suddenly

Hi,
since yesterday my Macbook falls suddenly asleep. It is plugged into the charger and I don't close the monitor. Just very suddenly it falls asleep. Could somebody explain me why is this happen? I checked the energy saving options and if the computer is working with the charger it shouldn't fall asleep.
Thank you very much

Hi, finally I have the console report. My mac just fall asleep in the middle of my work, and I checked the console, but the report is nothing important. My mac fall asleep between 7:17 and 7:24 and here the report(I took the report from a bit earlier, maybe there is something important:
2/28/10 1:31:04 PM [0x0-0x591591].jDownloader[29395] ShutDownHook: normal shutdown event, nothing to do.
2/28/10 1:54:43 PM com.apple.backupd-auto[37493] Not starting scheduled Time Machine backup - time machine destination not resolvable.
2/28/10 2:54:43 PM com.apple.backupd-auto[37545] Not starting scheduled Time Machine backup - time machine destination not resolvable.
2/28/10 2:56:13 PM [0x0-0x596596].org.videolan.vlc[29420] frame skip 8
2/28/10 2:56:15 PM [0x0-0x596596].org.videolan.vlc[29420] frame skip 8
2/28/10 3:54:43 PM com.apple.backupd-auto[37597] Not starting scheduled Time Machine backup - time machine destination not resolvable.
2/28/10 4:54:43 PM com.apple.backupd-auto[37644] Not starting scheduled Time Machine backup - time machine destination not resolvable.
2/28/10 5:54:43 PM com.apple.backupd-auto[37690] Not starting scheduled Time Machine backup - time machine destination not resolvable.
2/28/10 6:54:43 PM com.apple.backupd-auto[37739] Not starting scheduled Time Machine backup - time machine destination not resolvable.
2/28/10 7:19:33 PM [0x0-0x7c17c1].backupd-helper[37762] Not starting Time Machine backup after wake - failed to resolve alias to backup volume
Thank you very much!

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