Bedroom soundproofing

Hey,

there was a thread on here ages ago about soundproofing.  I’m looking to move, but I worry so much about my bedroom being directly attached to the next door neighbours bedroom.  I can’t sleep and get so angry if I can hear noises making that low rumbling noise through the walls.  I don’t mind during the day, although it’s not ideal.  But i can’t handle it at night.  Has anyone had a wall or room soundproofed?  Did it work?