One thing you can do is limit the detection angle of the sensor to more of a beam using a piece of PVC tube, or apparently a core from Kirkland toilet paper. See links below for details.
I imagine setting up the beam about three feet off the ground parallel to the floor.
Where you place this beam obviously depends on the layout of the room - maybe the beam is at the doorway, maybe it is beside the bed if the bed is against the wall, etc.
/Edit
Just saw @desertshores 's post and that you are using Android, which has an issue with delayed notifications - especially when unplugged for the night. Depending on the Android version, they enter “doze” mode and do not report Wyze notifications in a timely manner at all. We are talking delays of 10 to 45 minutes.
So I second @desertshores 's concerns, and if you do try it out, leave your Android device on the charger all night.