In my observations and experience as well as those of many brothers and sisters I know who are skilled in deliverance . . .
going to sleep chronically, ALMOST uncontrollably, HAS CORRELATED HIGHLY WITH DEMONIC OPPRESSION/POSSESSION.
Certainly not a certain clue. But an interesting clue. There are, of course, many other possibile contributing factors.
But it is plausible that demons are uninterested in their victim paying attention to THE TRUTH, THE WORD.