It seems you're running into an issue with your Mac not entering sleep mode due to the coreaudiod process. This process is likely releasing a prevent sleep signal, which results in your system remaining awake. Here are some solutions and suggestions based on various discussions and insights from users:

1. Terminal Command: A common and straightforward method to attempt is using the command sudo killall coreaudiod in the Terminal. This command will terminate the coreaudiod process, which may resolve the issue when it restarts automatically.

   More details can be found in this discussion on the Apple Community: Coreaudiod prevents iMac from idle sleeping.

2. Safe Mode Boot: Booting your Mac into Safe Mode can help identify the root of the problem. This mode disables certain drivers and software, potentially revealing if an external application is causing sleep issues.

3. Check for External Applications: Certain applications may interfere with sleep functions, such as music or communication apps that keep the system active. For instance, issues were reported with apps like eqMac preventing sleep, as documented in this GitHub thread: Bug: eqmac preventing macbook to sleep with coreaudiod.

4. Activity Monitor: Open the Activity Monitor, go to the CPU tab, and right-click the column header to add the "prevents sleep" column. This will help you identify which processes are preventing your Mac from sleeping. Users tracked issues with several processes, including coreaudiod, powerd, and bluetoothd, as noted in the MacRumors forum: Sleep prevented by coreaudiod, powerd, bluetoothd.

5. Review External Devices: Sometimes, connected peripherals can cause sleep interruptions. Review your Bluetooth device list and other connected hardware to see if any are preventing sleep, which is recommended in this Apple StackExchange post: Why isn't my MacBook sleeping?.

If these solutions do not resolve your issue, you may consider looking into additional troubleshooting steps or consulting Apple Support for a more individualized response. Each of these options should help you to pinpoint and potentially fix the issue with your Mac's sleep functionality.

Sources

Coreaudiod prevents iMac from idle sleepingMacBook Pro 14 M1 coreaudiod prevents sleep : r/MacOS - RedditBug: eqmac preventing macbook to sleep with coreaudiod #915MacOS App Preventing Sleep - Ring CommunitySleep prevented by coreaudiod,powerd,bluetoothdmacOS won't sleep from the Apple menu - codejam.infoWhy isn't my MacBook sleeping? - Apple StackExchange

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