Why does my Macbook keep going to sleep every 10-20 secs!

why does my Macbook keep going to sleep every 10-20 secs when first turning on then it seems ok after about 10 mins ? This has only happened since upgrding to Lion 3 days ago, it's driving me mad!

You are most welcome

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    You are most welcome

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    Norbert B wrote:
    Ujjval,
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    Ujjval Shah wrote:
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