Private, client-side calculation

Sleep Time Calculator

Find ideal bedtimes or wake times from natural 90-minute sleep cycles and sleep latency.

Mode

Time

STEP 01⏰

Pick your anchor time

Choose whether you need to wake up at a time or want to go to bed now.

STEP 02🌙

Add sleep latency

Include how long you usually take to fall asleep for more realistic timing.

STEP 03💤

Use full sleep cycles

Get options based on 3 to 6 complete 90-minute cycles.

Best Bedtime

—

Enter time

🌙

Best Wake Time

—

recommended option

☀️

Sleep Window

—

time asleep

🛌

Cycles

—

recommended

🔁

Fall Asleep

—

sleep latency

⌛

Sleep Schedule Inputs

Calculate from

Anchor time

Preferred cycles

Time to fall asleep 15 min

Sleep need profile

Sleep Cycle Zone Bar

🌙

Hit Calculate to see your cycle zone

Cycle Options

⏱

Options appear after calculation

Sleep Metrics

🧮

Metrics appear after calculation

✦ Result Explainer

✦

Your explanation appears here

▣ Sleep Action Plan

📋

Your plan appears after calculation

◎ What If Simulator

Test a different sleep latency and cycle count without changing your main result.

Simulated cycles

Simulated latency 15 min

—

Calculate your baseline first

● Ask About Your Result

Calculate first, then ask about bedtimes, wake times or sleep cycles.

Frequently Asked Questions

It counts backward or forward in 90-minute sleep cycles, then adds your selected fall-asleep buffer so the recommended time reflects when you get into bed.

Five cycles is about 7.5 hours asleep and six cycles is about 9 hours, which fits the common adult sleep target range better than shorter nights.

No. Treat the result as a planning guide. Real sleep depends on stress, caffeine, light, health, schedule consistency and individual sleep architecture.

Health & Calculation Disclaimer

Results are estimates generated locally in your browser from simplified 90-minute sleep-cycle math. They are for informational purposes only, not medical advice or a diagnosis. Persistent insomnia, excessive daytime sleepiness, loud snoring, breathing pauses, shift-work sleep problems, or health concerns should be discussed with a qualified healthcare professional. VisionVix accepts no liability for decisions based on this output.

Sleep Time Calculator — Best Bedtimes

Sleep Time Calculator

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