He finally fell sleep when the wind was dying down at around 3:00时态？

He finally fell sleep when the wind was dying down at around 3:00时态？

这里主句是【一般过去时态】，谓语动词【fell asleep】,fell 是fall 的过去式；when 时间状语从句是【过去进行时态】，谓语动词【was dying down】。祝你开心如意！