Set an hour of sleep, and put phone in silence mode at this hour until reactivation.
If
Every day of the week at
This Trigger fires only on specific days of the week at the time you provide.
Then
Mute ringtone
This action will mute your Android device's ringtone. If your device is already muted, it will remain muted.
Explore more great ways to automate Android Device and Date & Time