By M. Pedersen et al.
The activity measures showed that the CFS patients stayed significantly longer in bed, had a significantly delayed mid-sleep time and a more varied sleep-wake rhythm during weekdays compared with healthy individuals. On the KSQ, the CFS patients reported significantly more insomnia symptoms, sleepiness, awakening problems and a longer sleep onset latency than healthy individuals. These results might indicate that disrupted sleep-wake phase could contribute to adolescent CFS; however, further investigations are warranted.
Source: Pedersen M, Ekstedt M, Småstuen MC, Wyller VB, Sulheim D, Fagermoen E, Winger A, Pedersen E, Hrubos-Strøm H. Sleep-wake rhythm disturbances and perceived sleep in adolescent chronic fatigue syndrome. J Sleep Res. 2017 May 4. doi: 10.1111/jsr.12547. [Epub ahead of print]