The aim of the study was to examine the associations between Internet Gaming Disorder, Fear of Missing Out, and Sleep Quality among adolescents and emerging adults. A cross-sectional study was conducted among 67 individuals from Delhi NCR region (females=37 (62%) and males=30(45%). The data were collected via the convenience sampling method through social media platforms. The data obtained were analysed with the SPSS version 22 software package. The descriptive statistics for the sample under study shows a significance of internet gaming disorder, with an overall average score of 30.8657 (SD=12.22875), moderate risk of Fear of Missing Out, with an overall average score of 33.1791 (SD=10.979) and moderate levels of sleep difficulties with an average score of 11.5821 (SD=4.37676). Results show that male adolescents (15-19 years) tend to have higher levels of Internet Gaming Disorder and Fear of Missing Out as compared to emerging adults (20-24 years) and their female counterparts. Sleep Quality found to be slightly worse among male adolescents (15-19 years). Internet Gaming Disorder is found to be significantly correlated with Fear of Missing Out ( ρ = 0.626) at 0.01 % level of significance and moderately correlated with Sleep Quality (ρ= 0.288) at 0.05% level of significance. Also, Fear of Missing Out is found to be significantly correlated with Sleep Quality (ρ= 0.384) at 0.01% level of significance. The p values for Internet gaming Disorder(p=0.208) and Fear of Missing Out(p=0.105) found to be more than 0.05 and hence they are not the predictors of Sleep Quality. The findings from the present study suggest that due care should be taken to address online gaming behaviours and social media usage. The more a person fears being left out, the more they may indulge in online gaming and other digital activities to compensate, which will disrupt their sleep rhythms and lead to poorer sleep habits. Moreover, lifestyle, familial, and social variables, mental health, and digital usage can all contribute to poorer sleep habits and sleep disruptions.