Before You Can Fix Your Sleep, You Need to Know What It’s Actually Doing
If you have chronic insomnia, you already know your sleep is broken. You know you wake at 3 a.m., or lie there for 90 minutes, or both. What you probably don’t have is two weeks of clean numbers, the kind a CBT-I clinician needs to set a sleep window or run stimulus control. That’s what a sleep diary template gives you.
If you’ve been told to try melatonin, take a hot bath, or just stop scrolling, and you’re still awake at 4 a.m. three nights a week, this isn’t a hygiene problem anymore. Acute insomnia, the kind that follows a stressor, often resolves on its own. Chronic insomnia, defined by the American Academy of Sleep Medicine as difficulty sleeping at least three nights per week for three months or longer, does not. CBT-I is the first-line treatment, and the diary is where it begins.
Key Takeaways
- A sleep diary template is the foundation of CBT-I, the gold-standard treatment for chronic insomnia recommended by the American Academy of Sleep Medicine.
- Logging sleep onset latency (SOL), wake after sleep onset (WASO), total sleep time, and time in bed reveals your true sleep efficiency, the single most useful metric for treatment planning.
- Most people overestimate how long they lie awake. Two weeks of morning entries corrects that distortion and gives a clinician something concrete to set your initial sleep window from.
- Acute insomnia (under three months) and chronic insomnia (three or more nights a week for three months or longer) need different responses. Diary data is what tells you which one you have.
That precision is what a sleep diary provides. Two weeks of it is the standard baseline for every CBT-I program, mirroring the Consensus Sleep Diary developed by sleep researchers and used in clinical trials.
This sleep diary template is built around those same fields. 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 the reasoning behind each field before you start, read our guide on what CBT-I therapists track and why. If you’ve already tried the standard sleep hygiene playbook and it hasn’t held, see why hygiene alone doesn’t resolve chronic insomnia, or visit the Clarity insomnia page for the full toolkit.
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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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 the threshold most CBT-I protocols use to flag a problem worth treating. Below 70% is common in moderate to severe chronic insomnia. Tracking this number across 14 nights shows whether you’re drifting better, drifting worse, or stuck, and it’s the input a clinician uses to set your initial sleep restriction window.
What to Do With Your Two-Week Data
After 14 days of logging, look for these patterns:
Average Sleep Onset Latency (SOL)
Add up all your SOL values and divide by 14. An average above 30 minutes on three or more nights a week is the diagnostic threshold most clinicians use for sleep onset insomnia, and it’s the primary target for stimulus control therapy. The pattern matters more than any single bad night.
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 (WASO)
If your SOL is under 20 minutes but your wakings and total awake time are high, the issue is wake after sleep onset (WASO), not falling asleep. This is sleep maintenance insomnia, and the treatment emphasis shifts toward sleep restriction and managing nighttime arousal rather than wind-down routines.
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 log each morning’s entry, the app calculates SOL, WASO, and sleep efficiency for you, and the two-week summary exports cleanly for a therapist or sleep specialist. Visit the Clarity insomnia resource page to see what’s included.
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.
Medical disclaimer: This post is for informational purposes only and does not constitute medical advice. The content here is not a substitute for professional medical care, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health or a medical condition. If you are experiencing a medical emergency, call 911 or contact your local emergency services immediately.