My Husband Is 80 Years Old And Has Been Having

My husband is 80 years old and has been having problems sleeping and seeing things at night. He just had hernia surgery and missed taking his night time meds for two nights and slept with no problem. Last night, he took his meds and had a terrible night . He took potassium, fish oil, Coconut oil and QUEtiapine Fumarate 25 MG which is a new med to him, however this problem has been happening way before he started taking it. It seems this may have started happening when he started taking the fish oil
over a year ago. I just wondered if Fish Oil might be the cause of it.