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Table 1 Sleep quality, sleep duration, and aMT6s excretion rate (Mean ± s.e.m.) as a function of time of sleep onset

From: The relationship between the rate of melatonin excretion and sleep consolidation for locomotive engineers in natural sleep settings

Time-of-Day

Sleep Quality

Sleep Duration

aMT6s Excretion Rate

(2-hour bins)

(self-rated)

(hours)

(nmol/hour)

0000–0200

3.70 (0.04)

7.13 (0.06)

5.57 (0.22)

0200–0400

3.48 (0.06)

6.22 (0.09)

5.51 (0.35)

0400–0600

3.43 (0.09)

5.69 (0.14)

5.33 (0.49)

0600–0800

3.08 (0.14)

5.19 (0.19)

3.15 (0.45)

0800–1000

3.47 (0.15)

4.84 (0.26)

2.31 (0.51)

1000–1200

2.86 (0.21)

5.24 (0.33)

3.60 (1.01)

1200–1400

3.29 (0.23)

4.42 (0.31)

1.95 (0.46)

1400–1600

3.10 (0.18)

4.77 (0.45)

2.77 (1.29)

1600–1800

3.37 (0.19)

5.87 (0.51)

4.06 (1.30)

1800–2000

3.38 (0.11)

6.91 (0.22)

3.64 (0.50)

2000–2200

3.53 (0.05)

7.64 (0.11)

4.71 (0.27)

2200–0000

3.56 (0.03)

7.54 (0.05)

5.48 (0.15)