Night Shifts and My Team

I’ve been working in night shifts for past 4.5 years and looks like now I’ve become habitual. I don’t feel sleepy during night (If I have got good sleep during my daytime). Things are going fine with me so far but my new team members are struggling to work in night shift. I really love my team members because everyone in my team is so much hardworking and dedicated. And I feel bad as they are falling sick. In recent one month, half of my team was struggling with health issues due to night shift. I am trying to adjust their working hours like few hours their local time and remaining hours on PST. But with this schedule, I get myself alone at PST hours and get so much pressure to work on multiple things at the same time (because no help (team members) available at that time). Confused what to do 🙁