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Plasma melatonin (n = 14) in the evening of day 2 upon Bright day–Dim evening (a) and Dim day–Bright evening (b). Lines represent individual data. Data points below the detection threshold of 1.9 pg/ml (8.18 pmol/l) are illustrated as 0 values. The horizontal dashed line indicates the DLMO threshold of 10 pg/ml (43.05 pmol/l). To convert melatonin values from pg/ml to pmol/l, please multiply by 4.305
