I don't think I could write in the staff lounge either. Too many prying eyes. I'm impressed that y'all are so productive at night too. If I'm not already inspired, I am worthless at night time. Afternoon. That's my sweet spot for productivity.
Afternoon is usually my least productive time, either because I've already written all morning and am in desperate need of a shower and food, or because I've done nothing all day and am completely unmotivated. Also, I'm allergic to sunlight.
I've always been a night owl and used to do my best writing late at night, but the last couple years or so, I've gotten into a better routine of writing first thing in the morning. I guess that means I'm getting old. I will still stay up all night writing in the summer, but not usually during the school year.