Your hours, nights, quick returns and fatigue in one place
Updated October 8, 2026 · 2 min read
Capillary's My hours and Analytics reads your schedule from any scheduling app through its calendar link or an .ics file. It shows your hours per week, nights, quick returns under 11 hours and your hardest shifts, and you can rate your fatigue from 1 to 7 after each shift. Only you can see it.
Why count your own shifts
How many nights did you work last quarter? How often did you have under 11 hours between shifts? If you work at two hospitals, neither schedule shows the whole picture, and patterns like three nights in a row or an evening shift followed by a 07:00 start are easy to miss.
What you see
- Hours per week and the number of night shifts.
- Quick returns: every gap under 11 hours between the end of one shift and the start of the next.
- A calendar of every day you worked and a 24-hour clock of the hours you worked.
- Your hardest shifts, each drawn over the 48 hours before it with a predicted alertness line.
- A fatigue rating from 1 to 7 after each shift, on the Samn-Perelli scale, so you can compare nights, days and quick returns as your log grows.
| Method | What it looks at |
|---|---|
| Flags | What happened: a quick return, a backward switch, a switch between nights and days, a 4th day or 3rd night in a row, a shift over 12 h |
| Risk index | A published injury-risk index: factors for shift timing, place in a run of shifts and shift length |
| Alertness model | The three-process model: predicted alertness from time awake, assumed sleep and the body clock |
Worked example: one imported week
Say your calendar link brings in this week. Under the flags method, two shifts carry flags, and Tuesday, with two, counts as high-burden.
| Shift | Time | Rest before | Flags |
|---|---|---|---|
| Mon evening | 15:00 to 23:00 | 2 days off | None |
| Tue day | 07:00 to 15:00 | 8 h | Quick return, backward switch |
| Thu night | 23:00 to 07:00 | 56 h | None |
| Fri night | 23:00 to 07:00 | 16 h | None |
| Sat night | 23:00 to 07:00 | 16 h | 3rd night in a row |
The week adds up to 40 hours, 3 nights and 1 quick return. Tuesday starts earlier in the day than Monday's shift after only 8 hours off, so it gets two flags. Capillary also draws your hardest shifts over the 48 hours before them, with the sleep the model assumes and a predicted alertness line.
After Saturday's night shift you rate how tired you were. On the scale, 5 means moderately tired and 6 means extremely tired, finding it very hard to concentrate.
- 1Fully alert, wide awake
- 2Very lively, responsive, but not at peak
- 3Okay, somewhat fresh
- 4A little tired, less than fresh
- 5Moderately tired, let down
- 6Extremely tired, very difficult to concentrate
- 7Completely exhausted, unable to function effectively
What it does not do yet
- It does not measure sleep. The alertness model assumes sleep from your shift times; it does not read a watch or phone.
- It cannot change your schedule. It reads a copy through the calendar link or file, so changes still happen in the app your group schedules in.
- Its modeled numbers are estimates about people in general, not a measure of you or medical advice.
Try it
Sign in to Analytics, add your calendar link or .ics file under My hours, and your shifts fill in. For the methods behind the marks, see the fatigue risk index and the three-process model.
Common questions
- Can my scheduler or my group see my numbers?
- No. My hours and Analytics are private to you.
- Which scheduling apps work?
- Any app that gives you a calendar link to subscribe to, or lets you download your shifts as an .ics file.
- Is the alertness line a measurement of me?
- No. It is a model estimate from assumed sleep and the body clock. Use it to compare your shifts with each other, not as a reading of how alert you were.
See your own shifts this way.
Bring in your schedule from any scheduling app with its calendar link. Capillary charts your hours, nights, quick returns and hardest shifts. Only you can see it.