Machine goes to sleep faster than Energy Saver settings

Hi all,
(I've searched for existing threads aboutthis but couldn't find any. Hope I'm not "re" posting)
I use my laptop (MBP 2.4, 8gb, INtel Core i7) to play music live, so I need it to not go to sleep for at least... 30-40 minutes as I will frequently not touch it directly for that long as I'm busy playing my instruments. But it goes to sleep consistently after about 10 minutes even though I've got the display set to sleep abfter 1.5 hours and the computer to sleep after 2 hrs.
Then I noticed the same thing on my Mac Pro in my studio. Same Energy Saver settings, still goes to sleep after about 10-15 minutes. Which means I have to re-enter my password there too. Same thing on my older MBP. Theyr'e all on Lion 10.7.4.
This is very annoying. Anyone know what I'm doign wrong?
Huge thanks!

I'm not sure why Energy Saver is doing that, but you may want to download Caffeine from the Mac App Store. It's a menu bar application that you can click and unclick that, when clicked, keeps your Mac on until it is unclicked or if you close the laptop lid/manually put it to sleep.

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    ==========
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    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
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