Greets,
and then there's cargo airlines, who fly outsized and general cargo with big equipment. This is often round the clock operation and doesn't especially "target" nighttime for operations. A few of these in Europe as well.
Myself doing 550 hours block per year from a base in Central Europe and back of the clock flying takes maybe slightly over half of it. Freight planes get good utilisation normally, ours about 16 hours a day, so you fly when the "bus comes".
Entry requirements are as per normal, there's hidden gems in freight and that's why people don't advertise much for obvious reasons.
Hope this helps.
SS