Today, one of my professors said he almost didn't sleep last night. He participated in an international conference on robotics, and it was held online because of COVID-19 this year. It's convenient to be able to join from Japan, but the conference was administered on American time, which is 16 hours behind Japan. Thus, He had to stay up all night.
I think professors are always busy. They are superhuman.
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He had to stay up all night.