Workplace bullying (WB) studies focusing on perpetrators are increasing. Many processes, events, circumstances and individual states are being studied to understand and inhibit what causes some employees to become perpetrators. Using a 24-week diary design and drawing on the Conserva-tion of Resources Theory, we investigated how sleep, physical activity (PA), and being bullied predicted perpetration on a within-level. On a between-level, we controlled for supervisory posi-tion, psychological distress and mental illnesses over 38 employees from Spain and Turkey. Their average age was 38.84 years (SD:11.75). They were from diverse sectors (15.8% in manufacturing, 15.8% in education, 13.2% in wholesale and retail trade, 13.2% in information and communica-tion, 7.9% in health, 7.9% in other services and 26.3% from other sectors) with diverse professions such as finance manager, psychologist, graphic designer, academic, human resources professional, forensic doctor, IT and Administration head, municipality admin executive, waiter, and sales ex-ecutives. Data collection was conducted over 24 consecutive work weeks, where only 31 partici-pants were involved in perpetration (final observations = 720). We analyzed the data using multi-level structural equation modeling decomposed into within-and-between-person variance parts. The results indicated that on a within-level, PA as steps taken during the work week and being bullied positively predicted perpetration the same week, while sleep quality did not. By connecting sleep, physical exercise and WB literatures, we draw attention to the health condition of perpetra-tors. Organizations should actively inhibit workplace bullying and be mindful of employees’ phys-ical activities at work or commuting to work. Managers should also be attentive to physical fa-tigue that employees may feel due to their responsibilities in their private lives and allow employ-ees to rest and recuperate to inhibit negative behaviors at work.