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Sleep Cycle Calculator

Working

Free bedtime and wake-up planner based on 90-minute REM cycles.

What it's for

  • pick a bedtime from 90-minute cycles
  • time a 20, 60, or 90-minute nap
Runs in the browser152 checksEveryday tools
Open Sleep Cycle CalculatorChecked sleepcyclescalculator.comLast change recorded

We have checked Sleep Cycle Calculator 152 times since 15 Sept 2026, and it answered every time. Its visible text has not changed since we started watching.

What it does

This calculator finds bedtimes and wake-up times from 90-minute sleep cycles so you can plan 4–6 cycles instead of waking mid-sleep. Bedtime, wake-up, and nap modes include a fall-asleep buffer. It runs in the browser with no sign-up.

More in Everyday tools

Each answered its most recent check.

Looking for something else?

What stands out

  • No account required
  • Free

What we checked

  • App accessible

    The last check reached a working page.

  • Page rendered

    The last browser pass found an empty shell.

  • Screenshot kept

    We captured a picture of the page.

  • Looked at by an agent

    An agent opened the live site after the automated probe called it empty. The product paints. The probe had hit a bot check, not an empty page.

Looked
0

0 browsers

Opened
17

17 browsers

Checks
152

152 checks

Watching
0

Nobody yet

Browsers on this site, not verified people.

Screenshot of Sleep Cycle Calculator
Screenshot from our last captureThis site blocks embedding

Evidence

Each bar is one request we made
Checks
152
Working · last 40
100%
Median response
325ms
Watching since
15 Sept 2026

Of the last 40 checks, 40 answered (100%); the latest was on . Median response 325 ms. Watching since .

Browser render check

Checked 1 month ago in a real browser

0 of 1 page rendered

How the browser check works

Activity

Watching since
Last content change
None seen yet
Unchanged for
47 days
Certificate expires
in 31 days
  • Now redirects to https://sleepcyclescalculator.com/en1 month ago
  • Its embedding policy changed1 month ago
  • The browser render check changed1 month ago

How we track changes

What people say

No reviews yet.

Embed this status

For a README. It updates on every check.

Sleep Cycle Calculator — still works
[![Sleep Cycle Calculator — still works](https://itstillworks.app/api/badge/sleep-cycle-calculator)](https://itstillworks.app/verify/sleep-cycle-calculator)