Macpro goes to sleep without warning and I have to reboot to get it back

my macbook pro goes to sleep without warning on batt and I have to rebootto get it back

Hello stephenmeyer,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
About Energy Saver sleep and idle modes in Mac OS X
http://support.apple.com/kb/ht2412
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Best of luck,
Mario

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