Sleep is a natural periodic state of rest for mind and body with closed eyes characterized by partial or complete loss of consciousness. The depth of the sleep is not constant throughout the sleeping period. The quality of adolescent sleep may have changed due to smartphones, at the same time the prevalence of neck pain and low back pain have been increased. So, the researcher was interested to carry out a “A study to assess the quality of sleep among the adolescents using smartphone at a selected college”. Major objectives of the study were to assess the quality of sleep among adolescents. The research approach used in the study was quantitative approach. The investigator adopted a non-experimental descriptive research design. The study was conducted at SCPM College of Nursing and Paramedical Sciences, Gonda. The sample size of the study was 164 college students. Non probability convenient sampling technique was used to assess the quality of sleep among college students based on objectives. The tools used for data collection were demographic variables performance and Sleep quality scale (SQS) was used to assess the quality of sleep among adolescents. Data collection was done for a period of one week. It took nearly 30 minutes for the sample to complete data collection. The same procedure was followed for all samples. The data was analyzed using descriptive and inferential statistics. Major findings of the study was The Level of quality of sleep among adolescents using smart phone findings revealed that out of the 164 samples of adolescents, 4 (2.43%) have poor quality of sleep, 63 (38.41%) have mild quality of sleep, 88 (53.65%) had moderate quality of sleep, 10 (6.09%) had good quality of sleep. The findings of the study shows that the college students have some sleep problem with using smart phone.