zlacker

>>speckx+(OP)
This used to happen to my MacBook Pro, although it was a non Apple Silicon one. The issue was that I had changed the DHCP lease time on my router from the default to a really low value. I believe I had set it to 15 minutes. What I believe was happening was the MBP was waking up to renew its IP address every 15 minutes and by the time it went to sleep again, it was probably waking back up to repeat the process. Changing the value on the router back to its default completely fixed the battery drain issue on my MacBook Pro. I'd never have guessed the cause-effect except I made the change around the same time I purchased that new MacBook Pro and was paying more attention to any issues that might arise.

>>paulja+hb
This is a macOS bug; it doesn’t need an IP address while it’s asleep. Waking up to renew a DHCP lease is crazy.

Closed source OSes are such a bane.

>>sneak+7c
Macs doesn't need to wake completely to renew their DHCP leases. Bluetooth and Wi-Fi radios can act independently and on their own for this low level operations.

On the other hand, I don't consider my computer to wake up, take a backup, check system/app updates and my mails and handle those while I'm sleeping as a feature, not a bug.

>>bayind+qp
That is pre-Apple Silicon, before together integration of software and wakeups.

I can see a continuously renewed DHCP lease — with nothing else - useful for reducing the time to reconnected to your network, esp maybe on old/slow networks or routers.

You can Touch ID and get back in a second, and maybe for 5-10% of users, it was resulting in initial network connection slowdowns or errors with buggy online-only apps.

Find My (your device wants to maintain a connection if you have it enabled) is another reason. It must regularly connect (perhaps a long running socket), and I want to be able to remotely lock and wipe my device at any time possible, for example.