The study aim was to assess the sleeplessness among pregnant women of third trimester. Method: A descriptive cross sectional research study design was used to assess the sleeplessness among 131 pregnant women at Jinnah Hospital, Lahore. The purposive sampling technique was used. The population that is targeted was pregnant women of third trimester. Results: The study result showed that sleeplessness affect the health of pregnant women of third trimester. Descriptive analysis was done. Frequency and percentage was calculated. Bar charts are formed for quantitative values. The Cronbach Alpha, Bartlett’s and KMO values have been checked to insure the validity and reliability in our context .The values shows positive and significant results and tools were consider as reliable and valid for performing statistical analysis. Conclusion: Current study investigated a high rate of sleeplessness among pregnant women. The sleeplessness is one of the indications of high risk pregnancies and maternal and infant mortality. The majority of the pregnant women which was 95% reported that they are feeling unrested during the day. The majority of pregnant women which was 65% reported that they having trouble during falling asleep