Free Calculators Hub
Sleep Worksheet
Educational sleep worksheet: duration = wake − bed (overnight-safe); cycles = minutes ÷ 90; vs target hours you enter.
Limitation: Educational worksheet only—not a diagnosis or sleep-medicine advice.
How to Use the Sleep Worksheet
Enter assumptions you control; nothing is fetched live.
Enter bedtime hour and minute (24-hour clock).
Target hours are yours
Use a clinician- or guideline-informed target for your age and situation—do not treat cycle counts as a prescription.
What It Calculates
Computes elapsed sleep from bedtime to wake (crossing midnight when needed), divides by 90 minutes for an educational cycle count, and subtracts your target hours.
Examples
Classic 23:00 → 07:00
Inputs
Result
480 minutes overnight; 480 ÷ 90 ≈ 5.33; vs target 0.
Short afternoon window
Inputs
Result
90 minutes same-day; 1 cycle; −6.5 vs an 8-hour target.
Frequently Asked Questions
Still have questions about this calculation?
Try the CalculatorFormula
durationMinutes = wakeClock − bedClock (add 24h if wake ≤ bed); durationHours = minutes ÷ 60; cycles = minutes ÷ 90.
Formula
Duration
wake − bed (+24h if needed)
Cycles
durationMinutes ÷ 90
Scientific Background
Assumptions: continuous sleep between clocks; no latency or awakenings. Limitations: not polysomnography. Educational only.
Sources & review
Sleep Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
July 22, 2026
About Sleep
Centers for Disease Control and Prevention (CDC)
https://www.cdc.gov/sleep/about/index.html
See our methodology and corrections policy.