Temperature minimum

Temperature minimum is the lowest point in your 24-hour body-temperature cycle, usually about 90 minutes to two hours before your average wake time. 1

• 7:00 AM wake time: Your temperature minimum would likely be around 5:00 AM. 2
• Timing matters: Bright light, exercise, or caffeine before your temperature minimum can delay your clock, shifting sleep and waking later; after it, these cues can advance your clock, shifting them earlier. 3
• Why know it: Temperature minimum is a reference point for shifting your circadian clock to help adapt to travel, changing work schedules, or other schedule changes. 4