This research investigates the relationship between infant sleep quality, the use of electronic devices and video games before bedtime, and bullying behaviors in school context. Is infant sleep quality and the use of electronic devices before bedtime related to bullying? Does the use of electronic devices before bedtime affect sleep duration and sleep latency? The purpose of this study is to examine the relationship between the use of electronic devices before bedtime and infant sleep quality. Furthermore, it aims to analyze the relationship between infant sleep duration and latency, the daily use of electronic devices and video games, and bullying behaviors in school context. Participants were divided into two groups. One group included 860 children who responded to the Pittsburgh Sleep Quality Index, the Children's Sleep Habits Questionnaire (CSHQ-PT), and a Sociodemographic Questionnaire. The other group contained 51 children who answered a Sociodemographic Questionnaire and the Children's Sleep Habits Questionnaire (CSHQ-PT). A statistically significant relationship between sleep quality and the use of electronic devices before bedtime was found, for all devices except television. A statistically significant relationship between sleep quality and bullying behaviors was observed. A relationship between the use of electronic devices before bedtime and bullying behaviors was found which was statistically significant only for listening to music. A negative correlation was also discovered between sleep latency and daily use of video games. There seems to be a relationship between sleep quality and bullying behaviors in school and between the use of electronic devices and sleep quality. Also, listening to music before bedtime is positively related to bullying behaviors. Moreover, the daily use of video games before bedtime significantly affects children's sleep latency (and REM sleep).