The Nap Time Calculator helps you find the best wake-up time based on your chosen nap duration and natural sleep cycles. By entering the current time and selecting how long you want to nap, it estimates when you should wake up to feel refreshed rather than groggy. Short naps (around 20–30 minutes) boost alertness and energy, while longer naps that include full sleep cycles (90–180 minutes) can enhance memory and recovery. This tool is useful for students, professionals, and anyone seeking to improve productivity and mood through smarter rest.