Saturday, August 9, 2025

mac – Why is my MacBook powering off at night instead of staying in sleep?

It seems like an issue with power management in macOS 15.2 after the update. Here’s what you can try:

1. Reset SMC and NVRAM
These resets often fix unexpected power and sleep issues. Here’s how:

SMC Reset:

Shut down your MacBook.
Press and hold Shift + Control + Option on the left side of the keyboard and the power button for 10 seconds.
Release all keys and turn your MacBook back on.

NVRAM Reset:

Turn off your MacBook.
Turn it back on and immediately press Option + Command + P + R at the same time.
Keep holding the keys for about 20 seconds, then release them when you see the Apple logo or hear a second startup sound.

2. Check and Disable Wake Requests
Wake requests are tasks that cause your Mac to wake up during sleep. To check them:

Open Terminal (you can find it by searching in Spotlight).
Run the following command:

pmset -g log | grep -i "Wake Requests"

This will show you which processes or apps are waking the Mac (e.g., mDNSResponder, powerd).

To reduce unnecessary wake requests:

Go to System Preferences > Battery > Options.
Turn off Wake for network access.
Disable app notifications that may trigger wake requests, such as Calendar updates or background tasks.

3. Update macOS
Check for software updates in System Preferences > Software Update. Apple may have released a patch to fix this issue.

If none of this works, it might be worth contacting Apple Support for further assistance.

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