What is Sleep Log?

Sleep Log helps you monitor your sleep patterns by recording when you go to bed and wake up each day. Track sleep duration, rate your sleep quality, and view your history to identify trends — all stored privately on your device.

Pick bedtime and wake time, rate the night 1–5 stars, jot how many caffeinated drinks you had, and add a note about screens or stress if you like. Log how long you took to fall asleep and how often you woke, and each night splits into the numbers sleep therapists track: time in bed, time asleep, time awake, and efficiency, rolled up into a weekly average. The log spots patterns automatically: short or long stretches, drifting bedtimes (more than an hour of variance over a week), and trends in quality scores. Everything stays on your device and exports to CSV.

How to use

1. Enter your bedtime and wake-up time for last night using the time pickers.
2. Rate your sleep quality on a 1-5 star scale and optionally add a note about how you felt.
3. Review your sleep history log to see patterns in your duration and quality over time.

When to use

• Building an honest two-week baseline before talking to a GP about insomnia.
• Spotting whether late espresso or screen time correlates with poor nights.
• Tracking recovery sleep after night shifts, jet lag, or training blocks.

Result

You've been feeling tired lately. After logging a week of sleep data, you notice you average only 5.5 hours per night with low quality ratings. That's your nudge to set an earlier bedtime.

FAQ

What sleep duration is considered healthy for adults?

The CDC and the National Sleep Foundation recommend 7–9 hours for adults aged 18–64, and 7–8 for adults 65+. The insight engine here flags averages under 6.5 hours as short and over 9.5 as long, both of which can affect daytime energy.

Where is my data stored — is it sent anywhere?

Your entries are saved privately on your device and stay put when you refresh or reopen the page. Nothing is sent anywhere. To keep a portable backup or move the log elsewhere, hit Export CSV and save the file where you control it.

How does the tool figure out my bedtime is 'inconsistent'?

It looks at the last seven entries and computes the standard deviation of bedtime in minutes (treating after-midnight times as the next day). If that spread is over 60 minutes the insight appears, since irregular schedules are linked to worse sleep quality.

Should I log a nap as a separate entry?

The duration calculator assumes one continuous block from bedtime to wake time, so it isn't built for nap segments. The cleanest approach is to log the main nightly sleep here and keep a separate note for naps if you want to track them.

What goes into the 1–5 quality rating?

That number is subjective on purpose: how rested do you feel right after waking? Most people anchor 3 as 'normal', 1 as 'wrecked', 5 as 'rare deep restful night'. Consistency in your own scale matters more than a textbook definition.

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