Is there a Correlation Between Internet Use and Sleep and Cognitive Function Among Medical Students?

 Currently, the Internet is widely used by students for academic purposes; however, excessive Internet use might have negative consequences on students’ academic performance, sleep quality, and cognitive abilities.

 This study aimed to investigate the relationship between Internet usage, sleep quality, and cognitive function among medical students.

 This analytical cross-sectional study was conducted on 525 pre-internship medical students, including 304 first- and second-year students, 113 third-year students, and 108 externs, within 2019 and 2021 at Mashhad University of Medical Sciences, Mashhad, Iran. The participants were selected using a stratified sampling method. All participants completed the Cognitive Ability Questionnaire (CAQ), Internet Addiction Questionnaire (IAQ), and Pittsburgh Sleep Quality Index (PSQI). Data were analyzed using SPSS software (version 22).

 According to the IAQ, 430 participants (81.9%) were categorized as average Internet users, 94 participants (17.9%) had occasional or frequent problems, and 1 participant had significant problems with Internet use. Mean PSQI and CAQ scores were significantly higher among participants with occasional or frequent problems/significant problems than the average Internet users (P < 0.001 each). The total IAQ score showed a positive correlation with total CAQ (r = 0.439, P < 0.001) and total PSQI (r = 0.264, P < 0.001) scores. Among the PSQI subscales, sleep latency (P = 0.032), daytime dysfunction due to sleepiness (P < 0.001), sleep efficiency (P = 0.001), and overall sleep quality (P < 0.001) were worse in participants with occasional or frequent problems/significant problems than in average Internet users.

 Excessive Internet use negatively affects the sleep quality and cognitive performance of medical students.