According to the blurb on the video, the mantra was channelled by @C.Kendall , who happens to be a member here. Perhaps he can confirm if it is one of his, whether it may relate to the issues you are having and if so how best to remedy them.
I note that the audio has a continuous low frequency background noise. Sustained exposure to low frequency noises can effect your brain in all sorts of adverse ways. I recall reading a great deal a few years ago on this topic. Sustained exposure can produce all sorts of physical and perceptual issues. I was very interested in the subject a the time.
The eyesight reference is a big clue. Although the frequency is not low enough to be classed as infrasound, the principle likely extends to some degree.
Here is a study that was done on the effects of infrasound (very low frequency sound) on the visual functions of mice (I hate people who conduct experiments like this on animals as an aside note):
[Effects of infrasound on visual electrophysiology in mice] - PubMed.
I think you need to seriously consider the possibility that it is the background noise, not the words that is messing you up.
We may be able to offer more nuanced advice if you could elaborate a little more on what is happening in your sleep. ie, nightmares? Sleep paralysis? Physical sensations?
As darkest knight suggested, if you think what you have been listening to is the problem, stop listening to it and see if things improve over time.
As well as that, just to be sure, I suggest calling in our four legged friend Luna. She’s awesome.