Nightlights not keeping monster under the bed at bay

Children in my saves are being plagued by the monster under the bed and the usual "protections" are not consistently working. Nightlights only seem to work for those children/households where nightlights were installed from the beginning and if those children/households never experienced the monster scenario. For children/households where a child had encountered the monster at least once, nightlights are no longer working to prevent new visits by the monster. If a child who had a parent "spray for monster" (and without a working nightlight)  wakes up for any reason before 5AM, the monster shows up. Completely moving house and making sure the kids have nightlights the first night seems to "correct" the problem but it is no fix.  I have tested this on two fresh saves and my legacy. 

And why must the monster event happen EVERY NIGHT? I was told on another forum that the monster event is supposed to be intermittent yet my children without working nightlights will get the monster every night without fail. And what is even the point of "talking to the monster" if the kid is still too freaked out to sleep and will still freak out over the monster the next time it appears? Could we get an option in settings to prevent that feature? 

PC, no mods nor cc ever