How to find out what is waking up MacBook

[Flyview]

I noticed that my 2021 MacBook running Sequoia 15.4 is waking up from sleep 4+ times a night. It is not for long, but I would still like to figure out what's causing it and prevent this. I turned off WiFi and Bluetooth to try and prevent it but it's still doing it. There is no longer a "Power nap" option in settings either.

Are there logs I can check that record what process wakes up the system?

 

[Bigwaff]

The best utility I've come across for this purpose is SleepAid

Sleep Aid - View a Mac's sleeping habits, solve issues, improve battery life, stop sniffers

Sleep Aid is designed to reveal details on how a Mac sleeps. This is useful to see what's going on, and to help troubleshoot why a Mac won't go to sleep (even with lid closed), or why it keeps waking in the middle of the night. Sleep Aid includes many Apple sleep settings, as well as some...

ohanaware.com

 

[gilby101]

I too use Sleep Aid. It is essentially querying the power management log and giving you pretty (and hopefully informative) output.
Or just query the logs yourself in Terminal. Use one of more of these commands:
pmset -g log | grep -e "Wake from" -e "DarkWake" -e "due to"
pmset -g log | grep -e "Wake from" -e "DarkWake" -e "due to" -e "Start" -e "Hiber" -e "WakeTime"
pmset -g log | egrep "\b(Sleep|Wake*|Wake Requests|DarkWake|Start)\s{2,}"

Play around with the grep.

Whatever you do, the Mac will frequently wake up to check things.

pmset -g will show you the current settings. If you feel the need to reduce wakes more than you can in System Settings, try setting ttpkeepalive to 0. If you do, that will stop Find My from working when/if your Mac is stolen.