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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: Sleep Med. 2015 Dec 18;20:59–66. doi: 10.1016/j.sleep.2015.11.019

Figure 2.

Figure 2

Examples of 30-minute sampling melatonin profiles in which the DLMO was missed when using the fixed threshold methods, 3 pg/mL and 4 pg/mL. Each threshold is indicated by the dashed horizontal lines. A: DLMO was not computed because melatonin values were lower than both fixed thresholds. B: DLMO was not computed because melatonin values were higher than both fixed thresholds. The upward facing arrows indicate the DLMOs computed using the 2 SD threshold approach (21:09 for the profile in A and 22:48 for the profile in B).