Similar suicide rate decline happened in Japan, decline of work stress factors (e.g. commuting, office, boss) are suspected as the cause.
https://www.theguardian.com/world/2020/may/14/japan-suicides...
https://www.theguardian.com/world/2020/may/14/japan-suicides...
The concept of salary person sleeping at their desk until it's time to leave is a foreign concept to me. I'd have a hard time believing it if I hadn't heard about it so much.