Online alarm clock for 10:00 pm
Pause the reservoir filling at 10:00 pm when the alarm sounds, even if you are midway through checking hoses, taps, or levels before the water restriction begins. Set the alert now so the round hour becomes a clear break from the job rather than a time you notice after another task has distracted you.
Water running outside can easily drown out a quiet alert, so choose a strong alarm volume and test it from the place where you will be working. Keep the phone or computer close enough to hear above pumps, splashing, or household noise. This alarm cannot call you back to the reservoirs if the page stops running or the computer falls asleep, so use a separate alarm as backup when missing the signal would leave water flowing unattended.
Once the tanks are checked, make the 10:00 pm finish quick: close each tap, confirm the hose is secure, and leave any non-urgent tidying for daylight. Keeping the final check short preserves more of the night for sleep, while a written note about the remaining work can stop you from mentally revisiting it after you have gone inside.