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About this tool
Maps eye breaks across an overnight shift, flags the 3-5 am circadian low and sets a screen wind-down before you finish.
This planner lays 20-20-20 eye breaks across an overnight shift on the actual wall clock, handling the roll past midnight, and treats the early hours differently from the rest of the night. Breaks that land between 03:00 and 05:00 — the window around the circadian nadir, when core body temperature, alertness and error rates are all at their worst — are automatically lengthened. It also sets a screen wind-down before the end of the shift, because light in the final hours before you try to sleep is what pushes your body clock furthest out of step.
Open Night Shift Eye Strain Timer on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Handles shifts crossing midnight and prints every break as a time you can set an alarm for.
Breaks between 03:00 and 05:00 are lengthened automatically instead of being treated like any other.
Adds a wind-down window and adjusts the advice depending on whether you sleep after the shift.
Roughly 03:00 to 05:00. That window sits around the circadian nadir, where core body temperature and alertness bottom out, and it is where microsleeps, errors and the subjective feeling of eye strain cluster. Breaks taken there are the ones most worth protecting.
Match it to the room rather than simply turning it down. A bright screen against a black surround makes the pupil keep readjusting, which is uncomfortable; a modest light behind the monitor fixes that better than dimming alone. In the final hour or two before you sleep, lowering overall light exposure genuinely helps, because light in the biological night suppresses melatonin and delays the body clock.
A combination of things: blink rate is already halved during concentrated screen work, air conditioning dries the eye surface further, the contrast between a bright screen and a dark room is harsher, and you are working through the point in the 24-hour cycle when alertness is lowest. Persistent grittiness often responds to preservative-free artificial tears, but recurring pain or blurred vision needs an eye examination.
If you are going straight to sleep, yes. Morning daylight is the strongest signal for shifting the body clock, and a bright commute home directly undermines the sleep you are about to attempt. If you plan to stay awake and re-adapt to daytime, do the opposite and get bright light early. This is general information — shift-work sleep problems that persist are worth raising with a doctor or occupational health service.