Researcher Dr Michelle Miller said the findings added to the growing body of evidence suggesting that sleep duration played a key role in heart health.
The grandmother added that her daughter, Barbara Knight, believed she had last seen Michelle several years ago in a van with an older man at a shopping plaza in Cleveland.
Kenny added that there's a standing invitation for the president and first lady Michelle Obama to visit Ireland, even if Obama's schedule precludes him from stopping there as part of his trip to the upcoming G8 meeting of leading industrial nations, which is scheduled for June in neighboring Northern Ireland.