Find the perfect bedtime to wake up refreshed
What time do you need to wake up?
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Your Optimal Bedtimes
To wake up at , go to sleep at one of these times:
* Includes ~15 minutes to fall asleep. Recommended options give you 5-6 full sleep cycles for optimal rest.
How Sleep Cycles Work
Each sleep cycle lasts approximately 90 minutes and includes stages of light sleep, deep sleep, and REM (Rapid Eye Movement) sleep. Waking up between cycles—rather than in the middle of one—helps you feel more alert and refreshed.
Most adults need 5 to 6 complete cycles (7.5–9 hours) per night. This calculator factors in an average of 15 minutes of sleep latency (the time it takes to fall asleep) to give you the most accurate bedtime recommendations.
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Bedtime Chart for Common Wake-Up Times
Quick reference: optimal bedtimes for popular wake-up times (based on 5 sleep cycles / 7.5 hours + 15 min to fall asleep).
| Wake Up | 6 Cycles (9h) | 5 Cycles (7.5h) | 4 Cycles (6h) |
|---|---|---|---|
| 5:00 AM | 7:45 PM | 9:15 PM | 10:45 PM |
| 5:30 AM | 8:15 PM | 9:45 PM | 11:15 PM |
| 6:00 AM | 8:45 PM | 10:15 PM | 11:45 PM |
| 6:30 AM | 9:15 PM | 10:45 PM | 12:15 AM |
| 7:00 AM | 9:45 PM | 11:15 PM | 12:45 AM |
| 7:30 AM | 10:15 PM | 11:45 PM | 1:15 AM |
| 8:00 AM | 10:45 PM | 12:15 AM | 1:45 AM |
| 8:30 AM | 11:15 PM | 12:45 AM | 2:15 AM |
| 9:00 AM | 11:45 PM | 1:15 AM | 2:45 AM |
Green = recommended (5 cycles). Use the calculator above for custom times and adjustable sleep latency.
Frequently Asked Questions
How many hours of sleep do I need?
Most adults need 7 to 9 hours of sleep per night, which is 5 to 6 complete 90-minute sleep cycles. Individual needs vary, but consistently getting fewer than 6 hours is associated with health risks.
What is a sleep cycle?
A sleep cycle is a roughly 90-minute period that includes stages of light sleep (NREM 1-2), deep sleep (NREM 3), and REM sleep. You typically go through 4-6 cycles per night. Waking up between cycles helps you feel more refreshed.
Why do I feel tired after 8 hours of sleep?
Feeling tired after 8 hours often means you woke up during a deep sleep phase in the middle of a cycle. Using a sleep cycle calculator to align your wake time with the end of a cycle can help you wake up feeling more alert.
What is sleep latency?
Sleep latency is the time it takes to fall asleep after lying down. The average is about 15 minutes. This calculator accounts for sleep latency so the bedtimes you see include that buffer. You can adjust this in the settings.
Is it better to get 6 hours of sleep or 7.5 hours?
7.5 hours (5 complete sleep cycles) is generally better than 6 hours (4 cycles). Five cycles give your body enough time for adequate deep sleep and REM sleep, which are critical for memory, immune function, and emotional regulation.
Should I take a nap if I didn't sleep well?
A short 20-minute power nap in the early afternoon (1-3 PM) can help compensate for a poor night's sleep without disrupting your next bedtime. Avoid napping after 3 PM or for longer than 30 minutes.
What time should I go to bed if I wake up at 6 AM?
For a 6:00 AM wake-up, the optimal bedtimes are 8:45 PM (6 cycles, 9h), 10:15 PM (5 cycles, 7.5h), 11:45 PM (4 cycles, 6h), or 1:15 AM (3 cycles, 4.5h). We recommend 10:15 PM or 8:45 PM for the best rest.
How can I fall asleep faster?
Try the 4-7-8 breathing technique: breathe in for 4 seconds, hold for 7, exhale for 8. Also keep your room cool (60-67°F / 15-19°C), avoid screens 30 minutes before bed, and maintain a consistent sleep schedule.