- How do you use the expression "-느라(고)"?

I'm curious about any constraints or nuances when using -느라(고) as a purpose expression in Korean. Usually, -느라고 indicates a 'cause' and often comes with a negative nuance. For example, like saying 'I stayed up all night studying.' However, it seems that there is no such nuance when indicating a purpose. I'm curious about how it differs in sentences like 'They were standing on the street waiting for the bus,' 'Yeonghee bit her lip to hold back tears,' 'He lied to win the affection of a woman.' Is there a difference compared to other intention expressions like -으려고 or -도록? As a foreigner learning Korean in places like Gangnam or Itaewon, could you share your experiences or advice on how to use this expression appropriately?