Recently, there has been increased interest in chronotypes and clinical differences between them. However, there is limited information about the potential influence of the chronotypes on clinical manifestations and symptom intensity of somatic diseases. The aim of this study is to evaluate the impact of biological rhythm differences and sleep quality on benign paroxysmal positional vertigo (BPPV) and larengo pharyngeal reflux (LPR) severity. Forty-four LPR patients, 43 BBPV patients and 42 controls were included in the study. The morningness-eveningness questionnaire was used to determine chronotypes, and the Pittsburgh Sleep Quality Index was used to assess subjective sleep quality. Both patient groups reported a significantly greater tendency to eveningness diurnal preferences compared to healthy controls. As with the circadian preferences, patients with BPPV or LPR characterized by poorer sleep quality and worse insomnia than non-patient individuals. It can be concluded that the circadian rhythm and sleep quality are related to the severity of LPR and BPPV.