The concept of psychological availability, which refers to an individual’s belief that they are physically, cognitively, and emotionally ready or confident to engage the self with their colleagues, as a mediator between proactive personality and adjustment.
https://www.inspiring-workplaces.com/stories/guest-blog-psyc...

William Kahn identifies psychological meaningfulness and psychological availability as the other two drivers of employee engagement. He defines psychological availability as the employee having the physical, emotional, or psychological resources to personally engage, given the distractions he/she experiences as a member of social systems.
https://www.inspiring-workplaces.com/stories/guest-blog-psyc...