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About this tool
Compare immediate, delayed and split daytime sleep schedules for overnight guard duty, with light and caffeine timing.
This planner lays out three workable daytime sleep schedules around an overnight security shift: sleeping straight after the shift, delaying sleep until just before the next one, or splitting it into an anchor sleep plus a pre-shift nap. Each schedule is built by adding the commute, a wind-down and your usual time to fall asleep to the shift end time, then checking the result still fits the gap before the next start. It also fixes the two things that actually decide whether day sleep works — the last caffeine of the shift and blocking morning daylight on the way home.
Open Security Guard Night Sleep Planner 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.
See straight-after, delayed and split side by side rather than guessing which suits the post.
Flags when the gap between shifts is simply shorter than the sleep the plan needs.
Concrete light, noise and temperature numbers for a bedroom used in daylight.
Either straight after the shift, when sleep pressure is highest and falling asleep is easiest, or delayed so the sleep ends shortly before the next shift and you start the night fresh. Straight-after suits shorter nights; delayed or split suits 12-hour posts where alertness in the final hours matters most.
Usually daylight and body-clock timing rather than a sleep problem. Morning light on the journey home is the strongest signal telling your body to be awake, and a bedroom above about 5 lux, 30 dB(A) or 19 °C makes day sleep fragmented. Dark wrap-around sunglasses on the way home, blackout blinds and earplugs address all three.
About 6 hours before you plan to be asleep. Caffeine has a half-life of roughly 5 hours, so a coffee at 04:00 still has around half its dose active at 09:00. On a 22:00–06:00 shift with a 07:00 bedtime, that means the last cup at about 01:00.
For total sleep time, split schedules generally get night workers closer to their target than a single daytime block, because the second period starts when the body clock is more willing. It is a practical compromise rather than an equal substitute for consolidated night-time sleep. Persistent sleepiness on nights, or falling asleep while driving, is a reason to see a doctor or occupational health rather than to keep adjusting the schedule.