If you compare "failure to buy noodles" to a stranger, then that bed is your expectation. The lost mood of buying noodles but not buying them seems to put myself in an atmosphere of "strangers actually sleeping in their own beds". This is a feeling of being ignored and alienated.
I don't know what "buying noodles" really means, but it should be used to simulate an idea: your inner reaction after your expectations fail, you feel alienated, as if a stranger has occupied your position, and you are at a loss when you are frustrated, as if you are standing in a space that no longer belongs to you and in an awkward position. I felt it, surprised, angry and embarrassed.