even; will go far so as to~
Expresses doing something extreme or going out of one's way, with a sense of 'even to the point of'.
This pattern emphasizes that the speaker thinks the action in the て-form is excessive or beyond what is reasonable, yet it is done anyway. It often carries a nuance of criticism, surprise, or strong determination. For example, if someone sacrifices sleep to study, you might say 寝ないでまで勉強する, meaning they go so far as to not sleep in order to study. The まで here means 'even to the point of', highlighting the extremity.