I fly (or flew, before the pandemic) on small turboprop planes fairly frequently, mostly between Scotland and Norway, and between different parts of Norway, fro

I fly (or flew, before the pandemic) on small turboprop planes fairly frequently, mostly between Scotland and Norway, and between different parts of Norway, from maybe 20 seats up to 40 - they are a common sight in small city airports. They are indeed very, very noisy - inside the cabin, you almost have to shout to be heard. It's a strange kind of loud though, in that it always seems to make me sleepy!