Sleep Calculator
Overview
Calculate optimal bedtimes and wake times based on 90-minute sleep cycles. Wake up feeling refreshed by completing full sleep cycles.
Key Facts
| Field | Value |
|---|---|
| Calculator ID | sleep |
| Category | Lifestyle |
| Vertical | Lifestyle & Culture |
| App route | /verticals/lifestyle/sleep |
| API endpoint | /api/public/calculate?id=sleep |
Inputs
| Input ID | Label | Type | Required | Default | Constraints |
|---|---|---|---|---|---|
calculationType | I Want To | select | Yes | wake | - |
targetTime | Target Time | text | Yes | 07:00 | - |
fallAsleepTime | Minutes to Fall Asleep | number | Yes | 14 | min 0, max 60 |
How to Use
- Choose Calculation Type — Select whether you want to wake at a specific time or are going to bed now
- Enter Your Details — Enter your target wake time and how long you take to fall asleep
- View Optimal Times — See recommended sleep/wake times for 3-6 complete 90-minute cycles
Result Surfaces
| Output | Display Type | Format |
|---|---|---|
| Computed results | result-card | - |
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FAQ
What are sleep cycles and why do they matter?
Sleep cycles are 90-minute periods moving through light sleep, deep sleep, and REM. Waking between cycles feels refreshing; waking mid-cycle causes grogginess. 5 cycles (7.5 hours) is ideal, 6 cycles (9 hours) works for some, minimum 4 cycles (6 hours) to function.
How much sleep do I actually need?
Adults need 7-9 hours (5-6 sleep cycles). Teens need 8-10 hours. Quality matters more than quantity - 6 hours of uninterrupted deep sleep beats 8 hours of restless sleep. Use this calculator to align with natural 90-minute rhythms.
Why do I feel groggy even after 8 hours of sleep?
You likely woke during a deep sleep phase mid-cycle. Use this calculator to time your alarm for the end of a cycle (7.5 or 9 hours, not 8). Also check: sleep quality (noise, light, temperature), sleep apnea, caffeine/alcohol before bed, inconsistent schedule.
Evidence
src/lib/calculators/registry.ts(metadata)src/lib/calculators/page-registry.ts(page/HowTo metadata)src/lib/calculators/lifestyle/baby-sleep.ts(calculator config)
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