I am not sure I have any experience with this

the closest I have got to this is when my dog died, for weeks after I could hear her running about the kitchen and playing with her toys, but later on I read an artickle that said that it's just a way pets let you know they are still their and started to think nothing of it

my one is smell, in particular blood (not sure why blood, just is) I can smell it without having any near me or on me. it really is strange