Definition
Short, deliberate periods of sleep — typically 10 to 30 minutes — taken to restore alertness, reduce fatigue, and improve cognitive performance without entering deep sleep stages that cause grogginess on waking.
Plain English
A brief sleep, usually under half an hour, taken on purpose to recharge so you feel sharper and more awake afterward.
Context Anchor
Seen in fatigue-management guidance and in discussions about maintaining situational awareness during training, flight planning, or long duty days.
Derivation
‘Power’ here means high-impact or efficient — a small input producing a strong result. Combined with ‘nap’ (a short sleep), the phrase describes a brief sleep designed to deliver disproportionate alertness benefits.
Why Pilots Care
Fatigue degrades decision-making and reaction time; a properly timed power nap can measurably reduce error risk on subsequent flight segments.
Analogy
Like giving a phone a short top-up charge so it runs reliably until the next full charge is possible.
Intuition Check
A power nap is not “pushing through” tiredness with willpower. It is a short sleep used on purpose to reduce fatigue for a limited time.
Example Sentence 1
Before the night cross-country, the instructor took a 20-minute power nap to sharpen his alertness for the flight.
Example Sentence 2
Instructors sometimes suggest power naps between training sessions when a student shows signs of mental fatigue.