Alcohol abuse does awful things to the brain, esp if not eating properly as well. The nutritional deficiencies caused wreak havoc with the drinkers perception of reality and they do actually believe the fantasies.
The annoying thing is u can get apps that apply filters to ur screen to turn off blue light in the evening but u can't get one for iPhone/iPad. I had one on my old phone as it was android and it worked quite well just made screen a little pink in the evening. Tablets/phones etc should come with a switch to toggle it on/off imo esp tablets aimed at children.