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Data represent rectal temperatures recorded every minute for 4 h before bedtime (time 0) and 20 h after from fifteen young women (age: 22 ± 4 years) in the mid-follicular and mid-luteal phases of their menstrual cycles. Women had serum progesterone levels in the luteal phase reflective of ovulatory menstrual cycles. Subjects followed their usual daytime schedules and spent the night in a sleep laboratory. Modified from [65].
