Health tool
Sleep log and trends
Record when you went to bed and woke up. The tool adds up duration, checks how regular your schedule is, and draws the last two weeks as a chart.
Add a night
Last 14 nights
Bars show hours of sleep; the band marks the 7–9 hour reference range for adults.
Recorded nights
What this log tells you
Two things matter most for feeling rested: enough hours, and a stable schedule. The log averages your recent nights, and measures schedule spread — how much your bed and wake times drift from day to day. A big spread is a common reason people feel jet-lagged without travelling.
How to use it
- Each morning, add last night: bed time, wake time, and optionally how you felt.
- After a few nights, check the average and the chart against the 7–9 hour band.
- If the schedule-spread number is high, try anchoring a fixed wake-up time first — it is usually easier than fixing bedtime.
Frequently asked questions
Where is my data stored?
Only in this device's browser storage. Nothing is uploaded to a server. Clearing browser data deletes the log, and it does not sync across devices.
How much sleep do adults need?
Most health bodies advise 7–9 hours a night for adults and about 7–8 for people over 65. The chart uses 7–9 hours as the reference band.
What does an irregular schedule mean?
Shifting bed and wake times is similar to jet lag and tends to worsen daytime alertness. The tool reports the spread of your recent times; a spread over about an hour is worth tightening up.
I sleep enough but still feel tired. Is that a problem?
Duration is only one part of sleep. Feeling unrefreshed most days, snoring with pauses, or waking often can point to quality or health issues worth discussing with a doctor.
Does weekend catch-up sleep help?
It can ease sleepiness, but a shift of more than two hours disrupts your body clock and makes Sunday night harder. Keep catch-up within about an hour.