Drift Light
Bedroom sleep tool

Caffeine and light sleep timing planner

Pair last-caffeine timing with evening light changes so the routine feels realistic.

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Practical output.

Use the result as a room test, not as a diagnosis.

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How to use this result

Caffeine and light are different cues, but people experience them in the same evening. A late coffee plus a bright room can make the routine feel switched on even when bedtime is near.

This planner does not calculate biology. It gives a practical last-caffeine gap and pairs it with an evening light step that is easy to repeat.

Use it to make tomorrow easier: move one drink earlier and one light cue lower.

Best use

Run the tool, choose one change, repeat it for two or three nights, then compare the room notes. A repeated pattern is more useful than one perfect-looking number.

Next useful pages

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evening lightBedroom light for sleep: a practical evening setupHow to shape bedroom light before bed with warm lamps, screen boundaries and a simple fade. screensEvening blue light and screens before bedA practical guide to close screens, bright rooms and the last hour before sleep. humidityBedroom condensation and sleep comfortWhy windows mist overnight and how humidity, ventilation and temperature interact.