ez hacks for japanese listening

ok so what i do is i play anime in the background while i sleep but the real trick is you gotta mimic the sounds even if you dont get them!! like when they do the high pitch tone thing just make a squeaking noise really fast over and over it trains your mouth and then your ears magically get it somehow. also just loop random news podcasts on 2x speed it sounds like gibberish but trust me it works eventually i think??