Every morning I have a message saying my iMac has restarted due to a Sleep Wake Failure problem.  What is this and how do I fix it?

I have a new iMac14 with Yosemite.  Every morning I now find a message saying my iMac has been restarted due to a "Sleep Wake Failure" problem and that a problem report has been generated.  How do I fix this or even figure out what is wrong? 

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.

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