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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: Neurol Clin. 2012 Nov;30(4):1167–1191. doi: 10.1016/j.ncl.2012.08.011

Figure 3. Actogram of a patient with DSPD.

Figure 3

Panel A shows an actogram derived from actigraphy data obtained over 9 days in a patient with severe DSPD. The yellow lines depict light exposure. The high amplitude dense bars are representative of wakefulness and no to low activity time is representative of sleep. Note that average sleep onset is 5-6 am and wake time from noon to 1 pm. Note the stable delay of the sleep–wake rhythm in relation to the conventional sleep time and wake-up time. Panel B shows the 24-hour plasma melatonin level rhythm of this patient. The dim light melatonin onset (DLMO) was defined as an absolute threshold at 10 pg/mL. The DLMO of this patient is delayed at 1:23am (which is approximately 5 hours later than would be expected in non-delayed persons).