Introduction There are several changes which occur during the pregnant state that can impact directly or indirectly on breathing. A questionnaire based survey of sleep disorders amongst pregnant subjects attending a tertiary care hospital in New Delhi. Material & Methods The study was based on a questionnaire. It contained, besides personal identification of the subject, a set of 35 questions. In addition it also had the Epworth Sleep Questionnaire. A validated questionnaire for anxiety and depression was also used. Details of present pregnancy (parity, gravida, last menstrual period, expected date of delivery and period of gestation) was also recorded. The total number of pregnant subjects interviewed was 325. They were selected randomly from those attending the ante-natal clinic of Safdarjang Hospital & Vardhman Mahavir Medical College, New Delhi. Observations The overall prevalence of snoring was 13.5%. It correlated positively with depression (p<0.075) and gestation period (p<0.016). The overall prevalence of SDB was 9.5%. It correlated positively with gestation period (p<0.042) BMI (p<0.05) and disorders of initiation & maintenance of sleep (DIMS) (p<0.005) and depression (p<0.021). The overall prevalence of DIMS was 47.6%. The prevalence of DIMS was maximum in the third trimester; and it showed a positive correlation with rising gestation period. The overall prevalence of Restless Leg Syndrome (RLS) was 15.7%. It was most prevalent in age group 21-25 years (p<0.045). It showed rising trend with increase in gestation period (p<0.049), increasing parity (p<0.071) and decreasing hemoglobin concentration (p<0.047). The overall prevalence of depression was 11.4%. It correlated positively with increasing parity (p<0.045). The overall prevalence of anxiety was 18.1%. It correlated negatively with increasing age (p<0.057) & BMI (p<0.067) and positively with increasing gestation period (p<0.099). The overall prevalence of excessive daytime sleepiness (EDS) was 30.5%. It correlated negatively, with

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