edit- I know what "factory fatigue" means, but I don't entirely agree that spraying something further from your nose is beneficial. Many spray their wrists and then smell their wrists constantly.. the scent remains there and the longevity and sillage of it vary depending upon the fragrance.
Here's a good example: You spray your wrists with 2 sprays of CK Be. You smell it once in an hour, you then smell it in the following hour and it's pretty much gone. vs. You light a glade scented candle in your room.. you smell it strongly for the first few minutes.. then it begins to subside (factory fatigue) You step out of the room for 10 minutes and walk back in and the smell is there and as strong as ever.
Fatigue of the nose is 100% true, but blaming longevity and sillage problems on "factory fatigue" is pretty lame. Quite common on basenotes as well. As I said.. true to an extent.. but not the root of sillage and longevity issues.
Rather than blame our noses, blame the fragrance.