Not Medical Advice
This tool provides general educational estimates based on typical sleep-cycle averages. It is not medical advice. If you have ongoing sleep problems, please consult a qualified doctor.
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Your Data Stays on Your Device
Everything you enter — sleep times, diary entries, schedules — is saved only in your browser's local storage. Nothing is uploaded to any server. We never see your data.
🔔 No App · No Install · Browser Push
Free Bedtime Reminder
Set your target bedtime. Your browser sends you a push notification at wind-down time — every night, automatically, for free. No app download, no account, no email.
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No Reminder Set
Configure your bedtime below and enable your reminder.
⚙️ Reminder Settings
Enable nightly reminder
Fires every day at your wind-down time
Also remind at wake-up time
Optional morning alarm to keep your schedule consistent
❓ How It Works
1
Set your bedtime and how early you want the reminder. Click Save.
2
Your browser asks permission to send notifications. Click Allow.
3
Keep this tab open (or bookmark it and open it before bed). The reminder fires automatically at your wind-down time.
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Pro tip: Add this page to your phone's home screen (Share → Add to Home Screen on iOS, or Install App on Android Chrome) for the best daily reminder experience without keeping a tab open.
📱 Browser Compatibility
Chrome / Edge (Desktop)✅ Full support
Chrome (Android)✅ Full support
Firefox (Desktop)✅ Full support
Safari (iOS 16.4+)⚠️ Requires Add to Home Screen
Safari (macOS)✅ macOS Ventura+
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Reminders use the Web Notifications API and are processed entirely by your browser. No data is sent to any server. The tab must be open for the reminder to fire. For background notifications, use the Add to Home Screen / PWA install option.