I’m regularly woken up at 5am onwards by plane noise. They do seem to go on until midnight. The large ones are obviously Heathrow but there are a lot of smaller London City ones.. some days we get planes every few minutes. we’ve lived here for nearly 20 years. We never used to be under Heathrow flight path - I guess a few years ago many were re routed from over SW London.. obviously it was quiet during the pandemic but both airports are now up to fully capacity again.. and London City is trying to expand further.