On the iPhone X, there is a button at the bottom to stop the alarm. No need to Raise to Wake, the alarm already woke the phone.
The button in the middle just snoozes the alarm (which is what I tend to hit unfortunately) and I was on 11.2.5. Just upgraded to 11.2.6, and the same behavior works. I have Raise to Wake enabled, but I left it flat on my desk next to me.
I was afraid of that feature being iPhone X only due to the lack of a button.
Since you power down, that is a reboot. The reset and restore you have not tried. The backup will allow the restore to put back your settings and data. If the backup is not encrypted, then your passwords may need to be re-entered for WiFi, Apple ID and email.
I have restored several times testing theories, resolving issues. I haven't lost any data yet.