Sleep

Here is an interesting fact I heard on the radio this morning and did a Google search to confirm: "Before Thomas Edison’s invention of the light bulb, people slept an average of 10 hours a night; today Americans average 6.9 hours of sleep on weeknights and 7.5 hours per night on weekends."

No wonder there is a Starbucks or Caribou Coffee in every single office building in downtown Minneapolis.