Hidden alarm at everyday 12AM I have the Lenovo Moto Z Unlocked with sadly still Android M.

There's a hidden alarm everyday at 12 midnight, and it doesn't show it in the original clock app, which I haven't used an app other than that for alarms.

How can I diagnose this problem?
I found the problem. It turns out TimeTune was doing this (even though it is only a reminder app). I uninstalled and it disappeared.