Entry Sensor Triggers False Alarm Twice

I’ve been woken up twice already tonight (12.30a & 1a) with the alarm going off. Upon reviewing the logs, both times the bedroom sensor was the culprit, however there is only one sensor for that part of the house and it’s no more than two feet from me, and I have a clear line of sight to it at all times, and nothing has touched it/triggered it. 

I physically inspected it, and both pieces are attached, seem to be working, and millimeters within each other. It’s not near a heat source; and the sun really isn’t a problem, so no real reason for the issues. 

Thoughts on what could be the issue/how to resolve it?