First, the blaring sound of the alarm clock. It's 6 a.m. Monday morning. And you've got a full five days of commuting, meetings, expense reports, and forced water cooler chitchat ahead of you. Half of American workers reported having sleep issues on a Sunday night in anticipation of the workweek, according to a recent Monster.com survey. What's the best way to motivate for a long workweek? Download these songs to your iPod and hit the repeat button. These five classic tunes should become as critical a Monday morning staple as your a.m. coffee and a hot shower.