📖 Overview
This calculator gives a clear view of time spent asleep across your lifetime projection.
It adjusts daily sleep by interruptions and weekend catch up so the estimate better matches lived patterns.
🧪 Example Scenarios
Use these default and higher-pressure example inputs to explore how sensitive this calculator is before using your real numbers.
| Input | Base Case | Higher Pressure Case |
|---|---|---|
| Current Age (years) | 32 | 36.8 |
| Average Sleep Hours Per Day | 7.4 | 8.88 |
| Target Life Expectancy (years) | 82 | 94.3 |
| Wake Interruptions Per Night (minutes) | 18 | 21.6 |
| Weekend Sleep Extra (hours per week) | 1.5 | 1.8 |
⚙️ How It Works
Estimates sleep time consumed across life using your current sleep pattern and projection horizon with adjustments for interruptions and weekend catch-up.
The Formula
Adjusted Sleep h/day = Avg Sleep + Weekend Extra/7 − Interruptions/60
| Current Age | Completed years lived so far |
| Avg Sleep/day | Typical daily sleep duration |
| Life Expectancy | Projection endpoint age |
| Interruptions | Minutes of wake interruptions each night |
| Weekend Extra | Additional sleep hours across each week |
💡This is a perspective tool not a sleep prescription. Use it to understand time allocation patterns and recovery habits.
Quick Reference
| Adjusted Sleep | Share of Day | Sleep per 10 Years |
|---|---|---|
| 6.5 h/day | 27.1% | ~989 days |
| 7.5 h/day | 31.3% | ~1,141 days |
| 8.5 h/day | 35.4% | ~1,293 days |
When To Use This
- Use this tool when you need a fast decision during active planning or execution.
- Use this before committing money, time, or tradeoffs that are hard to reverse.
- Use this to compare options using the same assumptions across scenarios.
Edge Cases To Watch
- Results can be misleading if key inputs are missing, stale, or unrealistic.
- Very small or very large values may amplify rounding effects and interpretation risk.
- If assumptions change mid-decision, recalculate before acting.
Practical Tips
💡 Use realistic long-term averages instead of ideal sleep goals.
💡 Track interruption impact because fragmented sleep can reduce effective recovery.
💡 Re-run after schedule changes such as parenthood shift work or travel-heavy periods.
Frequently Asked Questions
❓ Why can weekend extra sleep matter?
Even modest weekly catch-up changes your long-horizon average materially.
❓ Is more sleep always better?
Needs vary by person. This calculator measures time allocation and does not diagnose health needs.