Overslept(’A`)

In this morning, at 8:20, the keynote lecture of Prof. Doi was held.
Prof. Doi is one of the greatest theoretician of polymer physics in Japan*1.
I really wanted to be on the lecture, but I had overslept...OTL
It is so regrettable('A`).
That is, the lecture of Prof. Doi is the most objection for me to attending this congress, but I had overslept...OTL
After all, the time of the lecture was so fast that I cannot get up. I am always late for events held in mornings, since I need time to sleep more than 10 hours.
I wondered if congress secretaries matched the lecture afternoon...OTL

*1:Someone say Prof. Hujiwara of Kyoto Univ. is the greatest.