Power Nap Calculator
The 20-minute reset, timed precisely.
The power nap is the Swiss Army knife of sleep - short, portable, and reliably effective when deployed correctly. Unlike longer naps, a power nap stays in light sleep, which means you wake up alert rather than groggy. Research at NASA, Berkeley, and the National Sleep Foundation converges on a window of 10 to 20 minutes as the sweet spot: long enough to measurably improve alertness, short enough to avoid sliding into deep sleep. This calculator helps you plan your power nap within that window based on your day. It accounts for time of day, sleep quality last night, and how much time you have. It also factors in the 5-10 minutes most people need to actually fall asleep, so a “20-minute nap” really means 25 minutes from lying down. Whether you are prepping for a critical meeting, driving a long distance, or just hitting the mid-afternoon wall, a well-timed power nap is often more effective than a second cup of coffee.
The Science
A 2008 study published in Sleep found that a 10-minute nap produced immediate improvements in cognitive performance that lasted up to 155 minutes. A 20-minute nap has similar benefits with slightly delayed onset. Naps over 30 minutes risk entering slow-wave (deep) sleep, where waking causes grogginess that can last 30-90 minutes. The power nap window exists precisely because it captures the benefits of light sleep without the costs of deep sleep.
How It Works
Enter the current time.
Set how long you can nap (10-25 minutes).
Tell us if last night’s sleep was poor (this affects recommended duration).
Get your nap start time and alarm time.