RENO — Sen. Dean Heller says there is a list of things that keep him awake at night: global issues such as the economy, debt and the nation’s lack of a growth strategy, and specifics such as the potential listing of the sage grouse and the spread of Internet gaming. In a wide-ranging interview with the Nevada Appeal, Heller said the two major parties have differences on issues including unemployment insurance benefits extensions and restoration of cost-of-living raises for veterans, but “not differences big enough we can’t get this thing done.”