Sleep/wake - shutdown on new iMac 10.9

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I use sleep from Apple pulldown  menu; after a while the computer wakes up, after a few minutes it shuts down.  New iMac, 10.9.  Help!
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The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.