Find My app draining battery overnight

My iPhone 13 battery was on 74% when I went to bed and when I woke up, my phone couldn’t even switch on because the battery had died. Battery health is 91% and the usage stated 100% Find My throughout the night. This never used to be a problem but now it’s draining 74% in 6-7 hours without any usage other than background Find My as all apps had been closed and the phone was on do not disturb.