Before You Can Fix Your Sleep, You Need to Know What It’s Actually Doing
Most people with insomnia think they know their sleep pattern. They know it’s bad. They know they wake up too often, or can’t fall asleep, or both. What they usually don’t have is the precise, consistent data that shows exactly how bad, on which nights, under what conditions.
Key Takeaways
- A sleep diary is the foundation of CBT for Insomnia (CBT-I), the most effective long-term treatment for chronic insomnia.
- Tracking bedtime, wake time, time to fall asleep, and nighttime awakenings reveals your true sleep efficiency.
- Most people overestimate how long they lie awake. A diary corrects this perception and reduces sleep-related anxiety.
- Two weeks of sleep diary data gives your provider enough information to create a personalized CBT-I plan.
That precision is what a sleep diary provides. And two weeks of it is the starting point for every CBT-I treatment program.
This guide gives you a complete, ready-to-use sleep diary template for two weeks of logging. It follows the same structure used in clinical CBT-I settings. Fill it in every morning within the first 30 minutes of waking. Estimate where you’re uncertain. Be honest on the bad nights, because those are the most useful data points you have.
If you want to understand the reasoning behind each field before you start tracking, read our guide on what CBT-I therapists track and why. If you want to understand why sleep hygiene alone hasn’t been enough, see why good habits don’t fix chronic insomnia.
How to Use This Template
Fill in one row each morning, covering the previous night. Do not try to fill it in at night or reconstruct it from memory the next evening. Morning recall is significantly more accurate.
Round your time estimates to the nearest 15 minutes. You don’t know exact times, and false precision adds noise rather than clarity. If you woke once for “a while,” guess whether it was 20 minutes or an hour. Either answer is more useful than leaving the field blank.
After two weeks, calculate your averages for each column. Your average sleep efficiency and average sleep onset latency are the two numbers most useful for next steps.
The Two-Week Sleep Diary Template
You can copy this template into a spreadsheet, print it, or use it as the basis for daily app logging. The fields are the same regardless of format.
Column Headers (fill one row per morning)
- Date (the date of the night you’re logging)
- Bedtime (time you got into bed intending to sleep)
- Sleep Onset (estimated time you actually fell asleep)
- Sleep Onset Latency (SOL, minutes between bedtime and falling asleep)
- Number of Night Wakings
- Total Time Awake During Night (minutes spent awake after first falling asleep)
- Final Wake Time
- Out-of-Bed Time
- Total Time in Bed (TIB, from bedtime to out-of-bed time, in minutes)
- Total Sleep Time (TST, estimated actual sleep, in minutes)
- Sleep Efficiency (TST divided by TIB, multiplied by 100)
- Nap (yes/no, and duration if yes)
- Caffeine (last intake time)
- Alcohol (yes/no, and approximate units)
- Pre-Sleep Anxiety (1-5 scale, 1 = calm, 5 = very anxious)
- Overall Sleep Quality (1-5, 1 = terrible, 5 = excellent)
- Notes (anything unusual: stress, illness, travel, noise)
Week 1
| Date | Bedtime | SOL (min) | Wakings | Awake (min) | Final Wake | OOB Time | TIB (min) | TST (min) | Efficiency % | Nap | Caffeine | Alcohol | Anxiety (1-5) | Quality (1-5) | Notes |
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Week 2
| Date | Bedtime | SOL (min) | Wakings | Awake (min) | Final Wake | OOB Time | TIB (min) | TST (min) | Efficiency % | Nap | Caffeine | Alcohol | Anxiety (1-5) | Quality (1-5) | Notes |
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| Day 14 |
How to Calculate Sleep Efficiency
Sleep efficiency is your single most useful metric. Here’s the formula:
Sleep Efficiency = (Total Sleep Time / Total Time in Bed) x 100
Example: You were in bed from 10:30 p.m. to 7:00 a.m. (510 minutes total time in bed). You estimate you slept about 5 hours 20 minutes (320 minutes). Your sleep efficiency is 320/510 x 100 = 62.7%.
A sleep efficiency below 85% is clinically significant. Below 70% is common in people with moderate to severe chronic insomnia. Tracking this number across two weeks shows whether you’re improving or whether you need a more structured intervention.
What to Do With Your Two-Week Data
After 14 days of logging, look for these patterns:
Average Sleep Onset Latency
Add up all your SOL values and divide by 14. If your average is consistently above 30 minutes, you have significant sleep onset difficulties. This is the primary target for stimulus control therapy.
Average Sleep Efficiency
Add all efficiency percentages and divide by 14. Below 85% average suggests sleep consolidation is a problem. This is the primary target for sleep restriction therapy.
Sleep Maintenance Patterns
If your SOL is reasonable (under 20 minutes) but your wakings and awake time are high, you have sleep maintenance insomnia rather than sleep onset insomnia. The treatment focus differs.
Weekday vs. Weekend Patterns
Compare your weekday and weekend rows. If there’s a significant difference, this can indicate social jet lag or schedule irregularity that’s disrupting your circadian rhythm.
Anxiety and Quality Correlation
Do your high anxiety nights consistently produce lower quality ratings? Or do you sometimes sleep better than expected despite high pre-bed anxiety? This tells you whether hyperarousal is a primary driver for you.
Using an App for Daily Tracking
The template above works on paper or in a spreadsheet. But for many people, daily app logging is easier to maintain consistently, and automated calculations remove the math entirely.
Clarity’s insomnia tracking is built around CBT-I principles. You can log each morning’s data, see your efficiency trend automatically, and build a two-week record that’s shareable with a therapist or doctor. Visit Clarity’s insomnia resource page to learn more about the tools available.
After Two Weeks: What Comes Next
Two weeks of data is the starting line, not the finish line. Here’s what the data can unlock:
- Working with a therapist: your sleep diary gives them exactly what they need to begin CBT-I. You skip the guesswork and go straight to intervention.
- Using a digital CBT-I program: most programs use your baseline diary data to personalize your initial sleep window for sleep restriction.
- Tracking treatment progress: continue the diary during treatment so you can see your efficiency improving week over week. Progress is motivating, and seeing it in data form is more convincing than relying on subjective memory.
- Talking to your doctor: if you’ve been prescribed sleep medication, your diary data can help your doctor understand whether the medication is actually improving your sleep efficiency or just increasing total time in bed.
The data you collect in these two weeks is yours. It tells your story more accurately than anything you could summarize in a doctor’s appointment. Use it.
This content is for informational purposes only and does not replace professional medical advice. Always consult your healthcare provider before making changes to your treatment plan.