If the police won't do anything after calling them - call your local councillor every time it happens. A few times of being called at 5:30 should get some action. If that doesn't work then escalation is the name of the game. Go up the chain of command - Your MP certainly won't like being called at that hour.

Just be nice and polite every time and ask them what can be done about it.

Call your Doctor and tell him the guy needs to be committed.