Insomnia, biological clock, and the bedtime decision: an economic perspective.

While insomnia can be a symptom of numerous mental and physical illnesses, it is frequently diagnosed as a sleep disorder in its own right, caused mainly by stressful life events or by non-synchronization of individuals' biological sleep-wake cycle with the one they choose to practice. Because of irregular work schedules, late-night entertainment, or rapid crossing of several time zones, individuals might retire to bed earlier or later than their biological bedtime, experiencing difficulties in falling asleep. The present paper develops a simple economic model of the bedtime decision, viewing the individual as a rational decision-maker who determines her insomnia level through consciously weighing the cost and benefit of deviating from her biological bedtime.