I bought my Air M5 in April and after about 3 weeks I noticed battery drain during sleep (https://forums.macrumors.com/threads/touchpad-bug.2481332/?post=34554411#post-34554411). I sent my Macbook to an Apple Authorized Service Provider, after week they told me everything was fine. Interestingly, after I got it back, the issue seemed to be fixed—there were no more dark wakes during sleep. Unfortunately it lasted only few months because today problem came back... what can it be? Maybe its a hardware issue?