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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 4.

Figure 4

Example of a 30-minute (A) and a 60-minute (B) 6-h sampling profile in which the 2SD thresholds were outliers. All profiles in this figure are from the same individual who participated in the summer study with a scheduled bedtime of 01:30. The 2 SD threshold was 17.2 pg/mL in the 30-minute sampling profile and 37.1 pg/mL in the 60-minute sampling profile. By adding to the 30-min (C) and 60-min (D) profiles samples acquired 1 h earlier, we illustrate that low daytime levels were missed by our 6-h sampling window and adding one hour to the sampling window can change the 2SD threshold and therefore the DLMO estimate. DLMOs computed from the available samples are indicated by upward-facing arrows with times provided in the box.