Define the groups before looking for a pattern
If you work Monday through Friday, ordinary weekday/weekend labels may be useful. If you work rotating shifts or weekends, use “before work” and “before a day off,” or another grouping that reflects your actual schedule. A Friday night followed by a Saturday shift belongs in the work group.
Choose the question before collecting a large list: “Does my wake time move later before a day off?” or “Do early shifts cluster with mornings I rate as less rested?” Use the same time format and the same meaning for a restfulness rating throughout. Keep manually reported times and imported device estimates identifiable rather than blending them silently.
NHLBI suggests discussing workday/day-off sleep habits with a clinician and keeping a diary of sleep, naps and daytime alertness. Its healthy-sleep guidance recommends a consistent schedule across the week. The comparison below is an original descriptive tool, not a clinical cutoff or a study of MornMood.
Worked example: timing differs, but the cause is unresolved
Casey records four illustrative nights. Bedtime is when Casey went to bed, not verified sleep onset. The interval to final waking includes any awake time, so it must not be labeled actual time asleep.
| Night ending | Next-day group | Bedtime → final wake | Recorded interval | Context |
|---|---|---|---|---|
| Monday | Work | 23:00 → 06:30 | 7 h 30 min | Early start; alarm |
| Tuesday | Work | 23:15 → 06:30 | 7 h 15 min | Early start; interrupted night |
| Saturday | Day off | 00:30 → 08:00 | 7 h 30 min | Later plans; no alarm |
| Sunday | Day off | 00:45 → 08:15 | 7 h 30 min | No alarm; nap later |
The work entries have a 06:30 wake time, while the day-off entries are 08:00–08:15. The recorded intervals overlap substantially. A fair description is “later bed and wake times in these day-off notes,” not “weekends fixed my sleep.” These four invented entries are too few to establish a stable personal pattern, and they say nothing about actual sleep stages.
Preserve context, uncertainty and missing nights
Keep a count of entries in each group. Ten work nights and one day-off night do not give equally informative summaries. If an entry is missing, leave it missing; do not add a normal night to balance the groups. Record estimated times as estimates.
Note a night affected by illness, travel, caregiving, a late event or a changed shift. Retain it in the diary and describe the context. You may review ordinary and unusual nights separately for your question, but do not hide a difficult night simply because it contradicts the pattern you hoped to see.
If restfulness appears different, inspect other recorded conditions before blaming a single habit. An observational diary cannot isolate causes. The useful next step might be a clearer question for a clinician or a practical discussion of schedule constraints, rather than changing medication, treating a disorder or forcing a sleep target from this example.
Keep the daily record in MornMood
MornMood’s current US listing describes manual sleep and mood notes, editable history and optional read-only Apple Health sleep import. Premium adds long-range insights, correlations, full history tools, reminders, CSV export and report export; daily logging remains available without Premium. Check current terms in the app.
The listing does not promise a dedicated workday/day-off grouping control, so use this standalone CSV for that comparison if needed. It also does not make a device estimate or correlation a diagnosis. Do not assume the app’s displayed duration has removed every awake interval.
If you often feel sleepy during the day, do not feel rested or have trouble adapting to shift work, NHLBI advises talking with a clinician. Bring source-labeled notes rather than an app-generated conclusion. MornMood is not a medical device and does not diagnose or treat sleep or mental-health conditions.
If the method fits your task, explore MornMood’s listed features on an iPhone. Check current features and plans before downloading.
See MornMood for iOSDownload the free worksheet
Use the CSV in Numbers, Excel or a spreadsheet editor. Four fictional nights plus a blank row; recorded intervals are fixed arithmetic examples, not actual time asleep. Replace them with your own observations. The CSV is separate from the app and no email is required.
Questions answered
Does bedtime-to-wake duration equal time asleep?
No. It can include time trying to fall asleep and awake periods. Label the interval accurately and retain any separate sleep estimate and its source.
What if I work on weekends?
Group nights by actual next-day obligations or shift pattern so the comparison reflects your schedule.
Can four diary entries explain why I feel better?
No. A small observational record can suggest a question, but it cannot establish a cause or diagnosis.
Continue with MornMood on iOS
Use the App Store listing to check compatibility, privacy information and current plan terms. A free download may offer paid features.
Download MornMood for iOSSources and product details
- NHLBI: healthy sleep habitsGeneral schedule guidance; not a prescription derived from this example.
- NHLBI: discussing sleep and keeping a diaryWorkday/day-off habits, diary context and reasons to discuss concerns with a clinician.
- MornMood on the App StoreCurrent US App Store product description; checked October 11, 2026.
Editorial method: primary guidance, a current Apple listing, an original worked example and an independent critique. No search ranking, install or outcome result is claimed.