When I was in my early 20's I worked in a call center for a gas/heating company. I was on the out of hours team, which involved doing nights and weekends.
Nights were 6pm-6am. We would receive calls up until about 9m and were allowed to make outbound calls up until 8pm between receiving inbound.
After that, we type up reports for supervisors to assess, this was the address of all jobs that couldn't be complete on first visit and what needed to be done.
Then we would print out a few hundred letters and have to fold them, place them in envelopes and get them stamped, placed In boxes to be picked up.
After about 1am, there was no work to be done, not a single thing. We basically just had to stay awake and answer the phone if there was a heating/ hot water emergency at 3am, which never came.
The company knew this and even provided a tv for us. People would watch movies, play games on their phone etc. Literally anything to help keep you awake and entertained until 6am.
Turns out they had a camera in the call center. Me and my partner (there were 2 of us on shift at a time) were written up because they saw me reading a book and him with headphones in.
I thought it was so ridiculous, but as I was young I didn't stand up for myself.