Bug living in my wall that sounds like a frog/cricket?

its creepy! its been making noises that sound seriously like a fricket... actually to be more exact it sounds EXACTLY like those little grudge kids from the movie.. haha. i dont know what it is, but its been here for like 2 weeks and i think its in my wall, cuz i cant find it in my room.. anyone got an idea? i just odnt know wether to be scared of it or what.. it wakes me up in the middle of the night and stuff and is really startin to disrupt me