Sleep Journal: How to Track Sleep and Mood Together

A sleep journal tracks when you slept, how well, and what happened during the day, so you can see how your sleep and mood move together. Each morning, log bedtime, wake time, how long it took to fall asleep, night wakings and how rested you feel. Each evening, add a mood rating and a few notes such as caffeine, exercise and stress. After one to two weeks, compare your best and worst mood days with the nights before them.

Why track sleep and mood together

Sleep and mental health affect each other. The NHS-run Oxford Health service describes it as a two-way relationship: sleep deprivation is strongly linked to low mood, anxiety and irritability, and mental health difficulties can in turn affect how well you sleep.

The US National Heart, Lung, and Blood Institute says that sleep deficiency can make it harder to manage emotions and cope with change, and has been linked to depression. NHS Every Mind Matters adds that longer-term sleep problems can affect your mood, appetite, relationships and social life.

These sources describe links, not guaranteed cause and effect. Your own data can show what the pattern looks like for you, which general advice cannot.

A mood and sleep log can help you:

• notice whether low days tend to follow short or broken nights
• see whether your sleep changes when stress, work or study picks up
• spot habits that may be getting in the way, like late caffeine
• give a doctor or therapist concrete information instead of "I sleep badly"

What to log for sleep

The Sleep Foundation's guide to keeping a sleep diary lists the items most diaries include: bedtime and wake-up time, how long it takes to fall asleep, number and length of interruptions, naps, perceived sleep quality, alcohol, caffeine and tobacco, daily medications and exercise. The NHLBI's sleep diary is similar and also asks how alert you felt on waking and how sleepy you felt during the day.

You do not need all of it. A useful minimum is:

• Bedtime and wake time
• Time to fall asleep (a rough guess is fine)
• Night wakings (how many, roughly how long)
• How rested you feel on waking (1 to 5)
• Naps (yes or no, and length)

What to log for mood

Neither of the diary templates above includes mood, so this part is where your own tracking adds something. Keep it quick:

• Mood rating at the end of the day (1 to 5 or 1 to 10)
• One or two feeling words such as anxious, flat, calm, irritable (a feelings wheel can help if you are stuck)
• Energy level
• One sentence of context: what was the main thing that shaped today?

For more ideas on what is worth recording, see what to track in a mood journal.

A simple sleep and mood template

Copy this into a notes app or notebook. It takes about two minutes a day.

Morning (last night):

1. Bedtime and wake time:
2. About how long to fall asleep:
3. Night wakings (number and rough length):
4. Rested on waking (1 to 5):
5. Anything that might have affected sleep (caffeine, alcohol, late screens, worry, noise):

Evening (today):

1. Mood (1 to 10):
2. Feeling words:
3. Energy (low, medium, high):
4. Exercise or time outside:
5. Caffeine and alcohol (what and when):
6. Biggest stressor or best moment:

You can also use the mood tracker for the mood side and keep the sleep lines in your notes.

How to look for patterns

The Sleep Foundation notes that doctors usually advise keeping a sleep diary for at least one week, sometimes two or more. That is a good window for your own review too.

1. Compare extremes. Pick your three best and three worst mood days. What did the nights before them look like?
2. Look at consistency. The NHLBI suggests keeping weekday and weekend sleep schedules within about an hour of each other. Check how irregular yours is.
3. Check the evening factors. Caffeine, alcohol, screens and heavy meals late in the day are common suspects.
4. Watch for the other direction. Notice whether anxious or stressful days are followed by poor nights.
5. Write one observation. For example, "My mood is lower after nights under about six hours." That is a pattern to test, not a conclusion.

If you want a broader approach, see how to track your mental health and understand patterns and the mental health tracker page.

Habits to test, one at a time

The NHS Every Mind Matters and NHLBI pages share a similar set of basics. Change one thing at a time so your log can show whether it helps:

• keep a regular bedtime and wake time, including non-working days
• build a calm wind-down in the hour before bed, with less bright screen time
• limit caffeine, alcohol and nicotine close to bedtime
• keep your bedroom quiet, cool and dark
• keep naps short (NHLBI suggests about 20 minutes, earlier in the afternoon)
• write down worries earlier in the evening if they keep you awake

When to get support

A sleep and mood log is for noticing patterns, not diagnosing. The NHS advises speaking to a GP if you regularly struggle to fall asleep, stay asleep or wake too early and changing your habits has not helped. Please also contact a licensed health professional if low mood, anxiety or poor sleep is lasting for weeks or affecting daily life. If you feel unable to cope or unsafe, contact your local emergency services or a crisis line in your country.

Sources and further reading

• Why sleep matters - Oxford Health NHS Foundation Trust - describes the two-way link between sleep and mental health.
• Sleep Deprivation and Deficiency - How Sleep Affects Your Health | NHLBI, NIH - sleep deficiency, emotion regulation and depression.
• Sleep Deprivation and Deficiency - Healthy Sleep Habits | NHLBI, NIH - consistent schedule, wind-down routine and nap guidance.
• Sleep problems - Every Mind Matters - NHS - sleep and mood, regular routine, when to speak to a GP.
• Sleep Diary: How and Why You Should Keep One | Sleep Foundation - what to record and how long to keep a diary.
• Fall asleep faster and sleep better - Every Mind Matters - NHS - worry, stress and anxiety can make sleep harder; tips including writing worries down.

Where Symplia fits

Symplia is a private mental health app for tracking and reflection. You can log daily mood check-ins with context, such as "slept badly" or "big deadline", write journal entries, and use Year in Pixels to see patterns over time. AI-assisted insights can help you notice recurring themes, though they are not a diagnosis. It can be used alongside therapy, and you choose what to share with a therapist, but it is not therapy and does not replace a licensed professional.

Try Symplia free at app.symplia.app. Monthly and Annual plans include a 7-day free trial.

Frequently asked questions