Individual differences in the phase and amplitude of the human circadian temperature rhythm: with an emphasis on morningness–eveningness

The average temperature minimum (Tmin) occurred at 03.50 h for morning-types and 06.01 h for evening-types.

• Morning-types (M-types) experience their temperature minimum earlier than evening-types (E-types).
• The Tmin occurred approximately at the midpoint of an 8-hour sleep period, but varied based on individual sleep patterns.
• E-types tended to sleep at an earlier part of their temperature cycle compared to M-types.
• Men had a Tmin that occurred about a half-hour later than women.
• Subjects with delayed circadian phases exhibited larger temperature amplitudes due to lower nocturnal temperatures.

AI simplified