How to calculate your temperature minimum and how to use it to your advantage?

Estimate your temperature minimum from your usual wake-up time, then use its timing to adjust light and temperature cues—and to plan focused work.

• Calculate it: Track your typical wake-up time over several days and estimate the temperature minimum at roughly two hours earlier. For example, a usual 8:00 a.m. wake-up suggests a minimum near 6:00 a.m. You don’t need to measure your actual temperature; the useful reference is the time. 1 2
• Timing, not temperature reading: Temperature minimum means the time your body reaches its low point in the 24-hour cycle; knowing the exact temperature value does not help with shifting your clock. 3 4
• Use light strategically: Bright light in the four to six hours before your temperature minimum tends to delay your clock, while light in the hours after it tends to advance your clock. So avoid bright light before the minimum if you don’t want to shift later; seek light after it when you want to shift earlier. 5 6
• Use temperature cues: Raising temperature can shift your clock earlier; lowering it can delay your clock. The effect depends on when the temperature change occurs relative to your daily temperature rhythm. 7 8
• Plan focused work: A 90-minute focused-work bout may fit well about four to six hours after your temperature minimum, as body temperature is rising. Treat this as a starting estimate and adjust for when you personally focus best. 9