Sleep Calculator

The calculator uses complete sleep cycles to build schedule options. In wake-up mode, it subtracts estimated sleep latency and several cycle lengths from the wake time. In bedtime mode, it adds sleep latency and cycle lengths to the bedtime.

It then compares each option with the selected age group's recommended sleep range. For children under school age, the recommended sleep range is total 24-hour sleep and can include naps. For adults, the calculator uses 7 to 9 hours as a practical planning range, while CDC and AASM guidance emphasize at least 7 hours for healthy adults.

Sleep-cycle timing is a helpful planning tool, but exact cycles vary. Consistent sleep timing, adequate total sleep, and good sleep quality matter more than trying to hit a perfect minute every night.

1) Age-Based Sleep Needs

Sleep needs change with age. Younger children need more total sleep, often including naps, while most adults need at least seven hours. Use the table as a planning range and adjust for individual health, schedule, and daytime alertness.

2) Bedtime vs Wake-Time Planning

If your wake time is fixed, calculate backward and protect enough time in bed. If your bedtime is fixed, calculate forward and see which wake times line up with complete cycle estimates and the recommended duration range.

3) When to Look Beyond a Calculator

If you regularly wake unrefreshed despite enough time in bed, fall asleep unintentionally during the day, snore loudly, wake gasping, or cannot sleep for weeks at a time, schedule advice is not enough. Those patterns deserve clinical evaluation.

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