I live in a terraced house, been here almost 10years. My neighbour on whole is fairly quiet and is retired. This year his flooring has clearly come loose, the subfloor that is because everytime he walks in his bedrooms there is alot of creaking noise.
To explain my living room and both bedrooms share the party wall.
Its so noisy that this morning he got up at 6am and it woke me up.
I've tried using ear plugs but then I miss hearing my alarm.
I've also noticed mine having started to make noise too now but im in the process of fixing mine, one room done one to go.
Would you go speak to your neighbour about it? It can't escape him how noisy it is because the one bedroom I haven't done I notice how bad it is when I do go in (rarely as its a spare room).