When I lived for a year in an old Eagles Lodge, turning it with friends into a gallery and theater, and the place had women's and men's rooms but no bathing facility, I used to use the university physical rehab patient showers an hour before any staff needed to show up for work. I was always the only one there. Which was good, that I wasn't nabbed. I supplanted that with visiting friends' places, so it wasn't every day that I hit the patient showers.
'My' microscope room, the one with the fluorescent micro, was kept dark when the mic was on. Reading slides was generally very peaceful, a sort of haven from the buzz.