Causes and Comorbidities
Insomnia and wake-time sleepiness are related to misalignment between the timing of the non-standard wake–sleep schedule and the endogenous circadian propensity for sleep and wake. In addition to circadian misalignment, attempted sleep at unusual times can be interrupted by noise, social obligations, and other factors. Finally, there is an inevitable degree of sleep deprivation associated with sudden transitions in sleep schedule. For example, a night worker who stays awake for 24 hours on the first night of a tour of duty is acutely sleep-deprived by morning.
Read more about this topic: Shift Work Sleep Disorder