I need some advice on a problem neighbour but i think he may have mental health issues!
Some of his history.
He moved into the street about 20 years ago after winning the pools, his wife ran off with another man about 7 years later.
We moved here last August but I grew up in the house 3 doors away where my Mum and Dad still live. We always used to play football outside the front of the house in the road and if our ball ever went down his drive he would run out and stab it. He also had a friend of mine up the fence by the throat. We were only 11, His dad came down and twatted him [thumbs up]
When my brother was 13 (he's now 20) he and a friend were sitting on the wall outside my parents house watching the bats that live in the roof of a house about 4 doors away from me. Neighbour came out with a video camera shoved it in brothers face and said "you were throwing stones at my house, why are you looking threw my windows? I know my rights, your gonna get locked up" My mum came out and covered the lens with her hand, ushered brother and friend inside and called the police. He was cautioned.
Another of my friends from the street moved into a house a couple of doors away and is a keen runner. Every day she used to go for a run, get home, go upstairs and change. Everyday neighbour used to stand in his garden with a pair of binoculars waiting for her. Her husband dealt with him.
Phew, this is a long post and I'm only half way through lol
When we moved in we had some bedroom furniture delivered quite late in the afternoon so had to wait till the kids went to bed before we put it together. I accidentally dropped a piece of wood and he shouted "SHUT UUUUUUUP" through the wall. The next day DH saw him in the garden, so opened the window and shouted "sorry about last night mate......" Neighbour interupted With "fuck off you stupid cunt, I know my rights and your gonna get fucked you twat just wait"
Yes this man knows his rights! 
Fast forward a month or so and theres a knock at the door. It was enviromental health, they have had reports that my television is too loud and my alarm clock goes off in the morning (!) I ask if she can hear my tele from the doorstep and she admits that she can't, I asked her if alarm clocks were supposed to go off...lol She left nothing more was said or done.
Fast forward again to July. Enviromental health ring me to say they have had complaints that my alarm clock was going off. I told them that this was the idea of them and he wont have to worry for another 6 weeks as its the 6 weeks holidays.
Fast forward to the last 2 weeks. DH works nights so once the kids are in bed the house is pretty much silent. I have heard the occasional shout at around 12am.
Last week I had just come out the bath and had gone to get changed when there was a banging on the wall and neighbour shouted "shut up you fucking wanker aaarrrrgggghhhhhhhhhhhhhh". Worrying! Then from then there have been again the occasional shout but last night he went to bed singing at the top of his voice slamming doors etc at one point it was like an elephant walking up hollow stairs. Then tonight From about half past 9 this evening I have been hearing alot of AAAAAARRRRGGGGHHHHHHH and WANKER FUCKING WANKER. His tele is up loud enough for me to know he is watching american and not long ago it was if he had come up to the wall to shout and it was a blood curdling sound like he is hurt. He isn't he's just a knob, but its scaring me :(
Does this behaviour sound familiar to anyone or what can I do, He only does it when DH is at work :( :(