It doesn't feel nervous. But if there is a threat, instinct will tell it how to get out of dodge.
An insect has a brain as part of its nervous system. The brain receives and interprets sensory impulses from all ganglia on the insect's body.
A tick
The crossword puzzle clue, "How an insect feels when it is nervous," is sometimes a five letter word that begins with an a. Antsy would be the answer for this clue.
Its the Nervous system.
An insect has 2 antennae which it uses to feel it's way around.
The most common insect sprays effect the nervous system of an insect, but there are others that have a different mode of action. As far as perfumes, I can't say.
you feel
It's a class of insecticides that act on insect's nervous system.
Because you are probably creepy.
Example sentence - Her husband was nervous about the birth of their baby.
you feel sleepy because you are nervous