Not getting enough sleep has become an epidemic, with many of us sleeping significantly less than the 7h - 9h recommended by the National Sleep Foundation. Unfortunately, in our western society, sleep is often treated as a commodity that can be traded for other activities. Chronic short sleep is linked to lower productivity and higher mortality risk. The Rand Corporation estimates the economic costs of sleep deprivation to be up to 3% of GDP. And studies suggest that chronic short sleepers do not require less sleep than other adults; rather, these individuals gradually accrue sleep debt over time.