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Câu hỏi thường gặp
Why do I feel tired even after 8 hours of sleep?
You might be waking in the middle of a sleep cycle. Waking at cycle boundaries can feel more refreshing than a strict hour target.
Should I use 5 or 6 sleep cycles?
Most adults do well with 5-6 cycles (about 7.5 to 9 hours including fall-asleep time), but individual needs vary.
How to Use the Wake-Up Time Calculator
Find the best times to wake up if you go to sleep now or at a set time.
- Enter the time you plan to fall asleep.
- See recommended wake-up times.
- Choose one at the end of a full sleep cycle.
Sleep Cycle Logic
Wake Time
Wake = Sleep time + 15 min + (n × 90 min)
Add fall-asleep time plus whole 90-minute cycles.
Example:
Input: asleep 11:00, 5 cycles
Calculation: 11:00 + 15min + 450min
Result: ≈ 6:45 AM
Real-World Use Cases
Nap Planning
Choose a wake time that avoids grogginess.
Early Starts
Plan sleep before an early commitment.
Tips
Tips
- Aim for complete cycles to avoid grogginess.
- Consistency in sleep and wake times improves sleep quality.
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