I have been having issues with my Mac screen waking up in the middle of the night for some years now. I think I may have finally solved it. Many sites have suggested that a faulty USB bus or oversensitive USB mouse could cause the wakeup, but I ruled that out when I migrated my OS to a new mac with new hardware. It had to be software related.
My solution is probably very uncommon, but perhaps the diagnostic steps I took would be useful to others.
I woke up at 5:57 AM to my mac screen turning on and my hard drive accessing constantly. I’ve written a script that can sleep my display from my phone, but instead of doing that I got up and started investigating.
I launched Console (Applications/Utilities) and took a look at the Console Messages log. At 5:52 AM there was a ReportCrash that said “Saved crash report for SMSDaemon” and a path to the crash file.
I googled “SMSDaemon OS X crash” and came across a macrumors thread that explained that it is an open source daemon installed by the Syphone utility, a piece of software that used to help get text messages off your iphone but is no longer supported. That thread didn’t have a lot of info on how to remove syphone though, so a google search of “uninstall syphone” lead me to this page, which has the following instructions:
1) Launch Syphone, open the Preferences, and UNcheck “Run helper app in the background” (leave it unchecked if it already is).
2) Close Syphone.
3) Go into ~/Library/Application Support/ and delete the folder named ‘Syphone’.
4) Go into ~/Library/Preferences/ and delete the file named ‘com.micromat.Syphone.plist’.
The Syphone application now just displays a link to techtool pro, but you can still access the preferences menu and turn off the Daemon. If you can’t run Syphone for some reason, the following commands will unload the daemon and delete it:
$ launchctl unload ~/Library/LaunchAgents/com.micromat.SMSDaemon.plist
$ rm ~/Library/LaunchAgents/com.micromat.SMSDaemon.plist
Apparently SMSDaemon may have had an enormous memory leak; I’ve come to my computer with 1.5 TB free and yet gotten the “there is no more disk space on the startup disk to write, please force quit some applications” errors before. Others have complained of memory leaks too; my machine seems to be running better now.
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