Strange Morphine Side Effects

Hi,

I know this is a bit left field here, but I’d appreciate any information that anybody could point me towards here... I was asked by my Palliative Care Team if I was experiencing any ‘strange’ side effects while using Morphine Sulphate to control pain following an operation? I replied by saying that I think I see ‘cats’ in the corner of my eye all the time?! She assured me test this is very common amongst the potential hallucinations that can occur & not to worry.

 

im just curious as to why it is cats? Can anybody point me towards any interesting articles on that perhaps?

Thanks.