Burping during night feeds

7 week old is EBF so I feed her side lying during the night. She almost always falls asleep while feeding, so for the most part I just let her sleep. She’s had some fussy mornings the past few weeks so I’ve tried burping her after every feed overnight but the mornings are the same and it just takes longer for her to fall asleep after a feed if I burp her. Is it necessary to burp after every feed to avoid trapped gas or can I let her sleep?