Abstract:The study was conducted to check the prevalence and associated factors among pregnancy. It was an observational cross sectional study.102 pregnant females was carefully chosen for the study. Different private and Govt. hospital of Karachi. Each participant was asked to stand in a quiet room Face to face interview was conducted. Consent form was given to females who were willing to participate. Physical investigation was done.The prevalence is 32 % in France. The prevalence of Brazil is 13.5%. In Japan the prevalence is 19.9%Research confirmed high prevalence of RLS in third trimester there is less awareness on RLS in females.RLS can have adverse effect in pregnant females as it may persuade sleep complaint .The exact cause of RLS is unknown .The factors include dietary factors ,hormonal factors, physiological changes and genetic factor during pregnancy. Restless Legs Syndrome was 47.1% with IRLS Scores between 21 -30, Prevalence of Very Severe Restless Legs Syndrome was 46.1% with IRLS Scores between 31 -40, there were none of the sample found at mild stage who had IRLS scores between 1 -10.the outcomes of Epworth Sleepiness scale, it was found that 64.7% of the females her Normal ESS Score of between 0 -10, so the overall prevalence of Epworth Sleepiness in our data was 35.3%. The prevalence of Mild Epworth sleepiness was 29.4% with ESS scores between 11 -14, prevalence of moderate Epworth Sleepiness was 5.9% with ESS Scores between 15 -18, and none of the sample was found to be at severe stage of Epworth sleepiness, i.e. a ESS Scores between 19 -24.