Background: Internet addiction is prevalent among all professionals’ groups and has many societal and health issues in prolonged internet users. But the research on the status of Internet addiction and its effect on feeling daytime sleepiness among school teachers are scanty which formed the basis of the study. Methods:A cross sectional study was conducted using Internet Addiction Scale (IAT) test and Epworth Sleepiness Scale (ESS) as instruments to assess internet addiction and its influence on daytime sleepiness among school teachers. The data was collected through online and analyzed for the statistical significance using software. Results:Out of 496 respondents, 42.74 and 57.26 per cent were females and males.  About 52.82, 37.90 and 9.28 percent were 25-40, 41-50 and >50years age group respectively.  The IAT score showed 45.97 per cent used internet normally. There were 34.88, 15.52 and 3.62 percent had mild, moderate and severe dependence upon internet respectively. However, no significant association was observed between demographic variables, age groups and internet addiction. The results of the ESS score revealed that 46.77 per cent respondents were unlikely to get daytime sleepiness while the remaining 42.34 per cent expressed the feeling of daytime sleepiness. About 10.89 per cent of respondents had higher ESS score (16 to 24) who needs to consider medical attention. A significant (p<0.001) positive association was found between males and females, and age groups with ESS scale score.  All respondents in the study used internet more than two hours daily for purpose and spending leisure time. However, the duration of internet use by the both gender and age groups did not vary which showed that no difference in using internet for purpose and leisure time. Conclusion:It is concluded that presence of internet addiction and feeling daytime sleepiness is revealed  among school teachers in the current study.