Napping or "power napping" is usually 15-20 minutes of sleep and thought to improve productivity while reducing stress.
Napping News
Google News:
Mens Journal: Snooze, You Win (2006)
Washington Post: Midday Naps Found to Help Fend Off Heart Disease (2007)
Cape Code Times Could napping be the key to success? (2007)
Inside Bay Area: Power napping chairs on short trial at SFO (2007)
Napping Drawbacks
- Wikipedia: Insomnia