How do I avoid these embarrassing situations?

I’m part of the student newspaper, and we have an office with a lock, the password of which I know. There are couches in there too. Sometimes, I walk in on people sleeping/getting intimate and I feel really bad for waking them up/cockblocking them.

There’s one small window that I can’t see through because it’s dark. I only find out once it has happened.

I use that room to store my books/coat and there are no lockers available. There’s also computers and desks in there so I do work there.

How can I avoid this uncomfortable situation?