Bugs... PLEASE ANSWER :)?

okay , so i was in my bedroom cleaning a few months ago and i found a bag of cookies under my chair that were really old and there was like 15 bugs inside but i didnt really care , but than a couple of days ago i went into my bed and 3 bugs were crawling on my BED! and than i realized that they were the same bugs that were inside the cookies. and now im wondering why they are in my bed ? so i looked them up and i think that they are Larder Beetles . and it said that they come for old food or dead mice in the wall . and there was a mouse in my apartment a couple of months ago and i heard it in the walls and then a few weeks later i didnt hear it anymore . soo do you have any suggestions why there were in my bed ? cause i dont think that there is any food in my room but i dont know . thank you sooo much for reading this :) :) :)