OK so if they are having sex at 6am why are they making so much noise? Why is the moving of furniture involved unless OP you cannot discern the sound of a headboard banging against the wall from a table being dragged across the floor. So many questions OP and we are here waiting for an answer.

Isn't it obvious that your neighbours have some piece of convertable furniture they sleep on and the sound of furniture moving is the process of converting a bed back into a sofa or something?

This can only go one of two ways: The passive aggressive notes war OR The Gives You Hell noise battle for the ages

doesn't everyone rearrange their shit at 6 am?

If they are rearranging the furniture and not doing something else ;) id suggest going to go get some of what ever they're smoking.

I think their having sex OP. Otherwise they are one weird individual who wants to move furniture every single day.

I used to do this too. (I didn't live above anyone!) I liked to work out at 5:30-6 am. And to have space to do yoga/the workout routine id need to move several pieces of furniture around every morning. Then would move them all back after.

This happened to me once - found out later they were running a credit card scam and rearranging boxes of stolen merchandise in the middle of the night. Report them to building and /or police, it may be worse than you think.

They're probably covering for making meth. You may want to call the police, unless lack of tooth retention and a pliable skeletal structure appeal to you.

I'm going with the converting a bed into a sofa. theory they got relatives or friends that are staying with them do they also I move furniture in the late evening