Have you had some major change in your life that might be prompting this? Are you expecting something?
What are you eating before going to bed?
Have you made some new friends?
There are any number of bizarre causes that we could look to before we cry “demon”.
Still, it is best to err on the side of caution and, simply from a “humanistic” perspective, ALWAYS maintain the integrity of self. By that I mean, even an “atheist” should have a problem with subjugating his spirit to another creature, be it malevolent or seemingly beneficent regardless of whether it is “real” or not.
Sure, say the St. Michael, the Hail Mary, the Our Father, or just say the name “Jesus” over a bunch of times. Those names have impact, period.
Don’t overlook the fact that this may be a way for your subconscious to manifest its needs for you to find your way back to God. God may be calling to you, but your eyes are currently blind to what he is trying to show you. Do not be afraid to call out to Him. He will hear you.
BTW: the funny thing about actual trolls is that their posts get read by so many others who may actually benefit from their attempts to undermine. It is always best to behave charitably, regardless of seeming intent. Yes? Remember God works to the good all things…
I pray you find peace and the Love of our Father’s embrace in your heart.
