What's actually shaping your nights?
Log when you sleep, how well, and what's around it — and let AI show you the patterns that matter.
Updated 26 June 2026
Your quality score averages 7.2 on nights when caffeine_last_time is before 14:00, compared to 5.1 when after 16:00 — and pre_bed_stress above 6 appears in 80% …
Most advice about sleep is one-size-fits-all. This tracker lets you build a real dataset about your own nights — bedtime, wake-ups, caffeine timing, stress, temperature, screen time — and see which of those things actually show up in your quality and energy scores. Instead of guessing, you'll know what matters for you.
6 fields. Done in 2 minutes each morning.
Fast enough to fit into any routine, specific enough to generate real patterns after 30 days.
Log, build, learn.
Log each morning
Capture your bedtime, wake time, how rested you feel, and any relevant evening factors like caffeine, alcohol, or screen time.
Build your sleep dataset
Over a few weeks, you create a real picture of your nights — not just hours slept, but what's around them.
Get your first AI insight
After 10–14 entries, AI begins surfacing which evening habits, timing, or conditions correlate with your best and worst nights.
Why people stick with it.
4 things Sleep Diary reveals about you.
- Which evening habits correlate with your best (and worst) nights
- How your bedtime, caffeine timing, and stress levels cluster together
- Whether your bedroom temperature or screen time show up in your sleep quality
- What your wake-up count and time-to-fall-asleep reveal about your patterns over weeks
Here's what arrives at 30 days.
Illustrative — your analysis uses your own data.
AI looks across your bedtime, wake_time, quality, wake_ups, caffeine_last_time, screen_minutes_before_bed, pre_bed_stress, and other fields to surface correlations you might not spot manually. For example, it might show that nights with caffeine after 15:00 cluster with longer time_to_fall_asleep, or that bedroom_temp_c below 18 correlates with lower felt_rested scores. These are illustrative patterns — your own data will reveal what's true for you.
“Your quality score averages 7.2 on nights when caffeine_last_time is before 14:00, compared to 5.1 when after 16:00 — an…”
People watching their own patterns.
For anyone who suspects their sleep isn't as simple as just getting eight hours — and wants to know what's really going on.
Common questions
Do I need to log everything every day?
No — you decide what to track. The more fields you fill, the richer the pattern data, but even partial logs build something useful over time.
How long before I see patterns?
AI starts finding correlations after around 10–14 entries. The more nights you log, the clearer the picture becomes.
Is this a medical sleep tracker?
No. This is a personal data diary. It shows you your own patterns — it's not diagnostic and doesn't replace medical advice.
What if I don't know my exact bedtime or wake-up time?
Your best guess is fine. Patterns emerge from general trends, not down-to-the-minute precision.
Can I track things like sleep aids or alcohol?
Yes — the tracker includes optional fields for sleep aids, alcohol, caffeine timing, screen time, meal timing, and more. You choose what to log.
Will this tell me I need eight hours of sleep?
No generic rules. It shows you what correlates with your own felt_rested and daytime_energy scores — your patterns, not textbook advice.
Pair with these trackers.
Log readings and what was happening around them — and let AI unhide which foods, walks, contexts, and lifestyle inputs are actually driving your numbers.
Log dose, mood, body, energy, and dysphoria — and let AI show the trans-affirming response pattern over time.
Log BP readings with context — and let AI show the trend and what's modulating it.
Free forever · Plus £7.99/mo · Pro £17.99/mo
Your sleep diary patterns
are in your data.
2 minutes each morning. Thirty days to your first real insight. Free.
Start tracking free