Sleep tools hub
Pick one room problem. Run one useful tool.
Each calculator gives a practical next-night action. No accounts, no uploads, no exact health claims.
Use the result tonight.
Then log one observation tomorrow morning.
Calculators and planners
ToolBedtime light routine builderBuild a practical evening light routine from bedtime, screens and lamp type. 
ToolBlue light evening exposure estimatorEstimate evening screen and room-light load before bed, then choose the first reduction step. 
ToolBedroom sleep temperature plannerCompare bedtime and morning temperature patterns and choose one room change to test. 
ToolBedroom humidity and condensation checkerUse room temperature, RH and window clues to judge next-night condensation risk. 
ToolSeven-night sleep environment experimentCreate a one-week bedroom test across light, screens, temperature, humidity or airflow. 
Tool37-minute Drift mode simulatorPreview a warm-to-low bedside fade inspired by the original Drift Light idea. 
ToolNight shift sleep light plannerProtect a post-shift sleep block with safe light timing and a dark bedroom handover. 
ToolChild and teen bedroom sleep environment checkerReview screens, warm light, night lights and room comfort for older children and teens. 
ToolSleep comfort running cost calculatorEstimate overnight running cost for fans, heaters, dehumidifiers or portable cooling. 
ToolMorning light reset plannerPair morning light with an earlier evening wind-down when your sleep clock has drifted late. 
ToolSleep cycle bedtime calculatorCalculate bedtime windows from wake time, age band and wind-down time. 
ToolChronotype light quizEstimate whether your routine leans early, balanced or late, then tune light timing. 
ToolSleep debt recovery plannerTurn a short-sleep week into a realistic recovery plan without wrecking the routine. 
ToolScreen cut-off planner before bedChoose the latest sensible screen cut-off from device type, brightness and bedtime. 
ToolWake-up light and sunrise alarm plannerPlan a gradual wake ramp, curtain timing and first-light cue for the morning. 
ToolJet lag light shift plannerBuild a gradual light-timing plan for moving sleep earlier or later before travel. 
ToolTemperature and humidity sleep plannerCombine room temperature, humidity and feel into one bedroom comfort action. 
ToolBedroom airflow and window plannerChoose a simple night airflow setup without direct draught or morning condensation. 
ToolCaffeine and light sleep timing plannerPair last-caffeine timing with evening light changes so the routine feels realistic. 
ToolEarly waking light routine checkerCheck whether early-morning light, temperature or room cues are pulling wake time forward. Related guides
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. 
temperatureBedroom temperature for sleep: practical UK room guideHow to read bedroom temperature patterns without chasing one perfect number. 
bedroom resetSeven-night bedroom reset planA simple week-long reset for light, screens, temperature, humidity and airflow. 
Drift fadeThe original 37-minute Drift Light fadeHow the simple warm-to-low fade idea can anchor a modern bedroom routine. 
sleep timingSleep cycle vs circadian rhythmThe difference between cycle timing and the daily body-clock routine. 
screensHow long before bed should screens stop?A practical screen cut-off guide based on device distance, brightness and activity. 
morning lightMorning light exposure for better sleep timingHow a morning light anchor supports an earlier and more stable bedtime. 
shift workNight shift bedroom setupHow to protect a daytime sleep block after late or overnight work. 
sleep debtSleep debt recovery with a light routineHow to catch up after short sleep without pushing the clock later. 
family routineKids and teen bedroom light routineA practical room routine for older children and teens around screens and night light. 
airflowBedroom airflow and sleep comfortHow to use window opening, vents and fans without creating draughts or noise problems. 
wake lightWake-up lights and sunrise alarmsWhen a gradual morning light ramp helps and when routine consistency matters more. 
clock shiftJet lag light timing before travelUse morning and evening light cues to shift a sleep schedule gradually before a trip.