Macbook late 2008 goes to sleep unexpectedly

I've started having problems with my MacBook a few months ago. It goes to sleep unexpectedly and sometimes it takes me 30 min to take it out of that state. I've tried utilities like Caffeine to prevent the sleep mode but nothing seems to work. The temperature is fine, the fans work (4,000 RPM) but something is wrong. I read on a few pages that it could be linked to the sensor that actually detects that the lid is closed and automatically puts the MacBook to sleep. I wish I could at least prevent the sleep mode from triggering since I cannot use my mac for work at the moment. I simply cannot rely on it. Any ideas?

Try a SMC reset which governs such things.
DALE

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