what were you doing when you stayed up late last time?

Well, the last time I stayed up late, I was doing my university assignments because I had to submit them by morning. It took about two hours, and I had to sleep around one a.m.

Honestly, I'm a night owl and a high school senior, so staying up late is one of my habits. Last time, I vividly remembered that I was fully occupied with a heavy workload at school, so staying up late was necessary for me to finish my assignments.