Power nap
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A power nap is a short nap, usually 30-60 minutes. It is thought by many to maximize the benefits of sleep versus time. This type of sleep pattern may be associated with polyphasic sleep; however, it is more often used to supplement normal sleep, especially when the sleeper has accumulated a sleep deficit.
Advocates of this sleep pattern recommend various durations for a power nap. Many have a precise time which they say is optimal; such claims are usually made without any scientific evidence. People who regularly take power naps usually have a good idea of what duration works best for them.
Some people take power naps out of necessity. For example, someone who doesn't get enough sleep at night and is drowsy at work may sleep during his or her lunch break. Others may prefer to regularly take power naps even if their schedule allows a full night's sleep.
In Australia, the Transport Accident Commission has invested an advertising campaigns, advising drivers to take a "15 minute powernap" to help reduce the risk of fatigue when operating a motor vehicle.