MTOW,
Somehow I don't believe it's all spin....
As I said, us humans are funny creatures.
A bit of steady background noise (whether music or white noise or pink noise, or just a bit of engine noise) will blank out all the other 'interference'.
Your mind drifts off to "did they really synchronize engine four properly" and next thing you're asleep.
No background noise? Every noise like a banging door is an intrusion that will stop you from going to sleep, or have you wide awake again.
CJ