# Sleep Calculator

> Find optimal wake times based on 90-min sleep cycles

Canonical page: [https://chrome-stats.com/d/sleep-calculator](https://chrome-stats.com/d/sleep-calculator)

## Overview

- **ID:** `sleep-calculator`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Removed
- **Publisher:** Severina Caroline
- **Daily users:** 29
- **Version:** 1.1
- **Last updated:** 2026-04-07
- **First published:** 2026-04-04
- **Size:** 14 KB
- **Data as of:** 2026-05-19
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/sleep-calculator/)

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- This permission has no access or impact on the user's system or data, thus carrying no risk.
- This extension is not longer available in the store

## Similar extensions and apps

- [Bedtime](https://chrome-stats.com/d/bedtime-) — 6 users
- [Snooze Math](https://chrome-stats.com/d/snooze-math)
- [Sleep Tracker](https://chrome-stats.com/d/sleep-tracker)
- [sleep-design](https://chrome-stats.com/d/sleep-design)
- [Sleep Quality Predictor BST](https://chrome-stats.com/d/sleep-quality-predictor-bst)
- [Sleep Timer](https://chrome-stats.com/d/sleep-timer) — 1 users
- [Sidereal Time Calculator](https://chrome-stats.com/d/show-sidereal-time-and-alarm) — 1 users
- [Sidereal Time Calculator](https://chrome-stats.com/d/siderealtimecalculatorandalarm)
- [Sidereal Time Calculator](https://chrome-stats.com/d/siderealtimealarmcalculator)
- [Sidereal Time Calculator](https://chrome-stats.com/d/sidereal-time-calculator)
- [Sidereal Time Calculator](https://chrome-stats.com/d/sidereal-time-calculator-alarm) — 5.00 / 5
- [Work Efficiency Analyzer](https://chrome-stats.com/d/work-efficiency-analyzer)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/sleep-calculator)