In order to easily infer the risk of sleep-related disease including sleep apnea syndrome, the present invention analyzes biological signals collected by a biological signal measurement device, determines the timing of appearance of fatigue, decrease in attentiveness, or a predetermined decreased state of wakefulness including sleepiness, calculates the number of appearances thereof per unit time, and estimates the risk of disease related to sleep from the relationship between the calculated number of appearances and a circadian rhythm of sleepiness.
DEVICE AND COMPUTER PROGRAM FOR ANALYZING BIOLOGICAL STATE