Table 1.

Core body temperature (°C) in bed before (A) and during (B) sleep, and after arousal (C).

Subject#	Gender	Body mass index (kg/m2)	A (before sleep)	B (during sleep)	C (after arousal)	B − A	B − C	C − A
1	F	17.9	37.2	36.5	36.8	−0.7	−0.4	−0.4
2	M	25.9	36.8	36.2	36.9	−0.5	−0.6	0.1
3	F	21.8	37.2	37.0	37.0	−0.2	0.0	−0.2
4	M	23.6	36.7	36.2	36.7	−0.5	−0.5	0.0
5	F	20.0	37.3	37.1	37.5	−0.1	−0.3	0.2
6	F	18.8	37.3	36.8	37.2	−0.4	−0.4	−0.1
7	F	17.6	37.3	36.9	37.0	−0.4	−0.1	−0.3
8	F	20.9	37.4	37.0	37.2	−0.3	−0.2	−0.1
9	M	24.5	36.8	36.5	36.7	−0.3	−0.2	−0.1
10	F	18.1	37.0	36.4	36.9	−0.6	−0.5	−0.1
11	M	19.8	37.1	36.5	36.6	−0.7	−0.1	−0.6
12	M	20.1	37.1	36.3	36.4	−0.8	0.0	−0.7
13	M	23.8	37.2	36.4	36.6	−0.7	−0.2	−0.5
14	M	21.4	36.7	36.2	36.4	−0.4	−0.1	−0.3
15	F	30.0	36.8	36.4	36.7	−0.4	−0.3	−0.1
16	M	37.5	36.4	36.0	37.3	−0.5	−1.4	0.9
17	F	33.0	37.1	36.5	37.7	−0.6	−1.3	0.6
18	F	29.0	37.1	36.4	36.6	−0.6	−0.2	−0.4
19	F	23.2	37.6	36.1	36.5	−1.5	−0.3	−1.2
20	F	36.9	37.5	37.1	37.6	−0.5	−0.5	0.0
21	F	22.2	37.0	35.9	36.7	−1.1	−0.8	−0.3
22	F	30.8	37.7	36.9	37.0	−0.8	−0.1	−0.7
23	F	30.0	37.7	36.9	37.3	−0.9	−0.4	−0.4
24	F	39.6	37.0	36.5	37.2	−0.5	−0.7	0.2
Mean			37.1	36.5	36.9	−0.6	−0.4	−0.2
SD			0.3	0.4	0.4	0.3	0.4	0.4
Pair-wise comparisons						p < 0.001	p < 0.001	p < 0.05

Values represent the mean of 30-min temperature readings (1,800 individual values) for subjects with complete sleep data (n = 24). Temperature was measured at the following time points: (A) the highest 30-min average value before sleep onset, (B) the lowest 30-min average value during sleep, and (C) the first 30-min average value after arousal. Sleep and awakening times were self-reported by each subject in an activity log book. Differences between time points (A − B; A − C; and B − C) were calculated using paired t-test.

F, female; M, male.