Web alarm clock for 11:22 p.m.
You are preparing well ahead of the hour when the roof must be secured against the night wind, so set the alarm for 11:22 pm before gathering rope, a torch, and rain protection. That leaves room to check the work before 12:00 am, when poor visibility can make a loose sheet or unfinished tie harder to spot.
Your roof-securing reminder is only useful if the screen running it stays active until 11:22 pm. A phone that goes to sleep earlier may prevent this browser alarm from sounding, and closing the page can also leave the roof without its planned prompt. Keep this page open, stop the phone from sleeping, raise the volume, and test that sound is coming from the speaker you expect.
Once the final fastening is done this late in the evening, keep the return indoors simple: place wet gear by the door, put tools somewhere they will not become a morning hazard, and dim the lights rather than starting another task. Finishing that routine soon after 11:22 pm preserves more of the sleep still available tonight, while a written note about anything needing daylight inspection keeps unfinished roof work from circling in your mind.