Working with the display closed

Hi,
I am running a process that takes a long time. It is stand alone and just works for around one and a half hours. When I close the display to go home, the computer sleeps and stops the process. Then when it wakes up, the process fails. Is it possible to set the computer to don't sleep when the display is closed?
Thanks in advance for your advice,
Guillermo

I have the same problem also.  Restarting isn't helping and the auto lock/unlock button is on.  Plus a couple of time when I turn it on it is asking if I want to power off.  That is when I push the button on the front to wake it up.  Not the power button on top.  I have an IPAd 2. Worked fine before the update. 

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