Not a lot of people are fond of having creepy crawlies and other insects getting near them, and especially not in body orifices like ears. Somehow, someway, however, certain insects still manage to get inside the ears, particularly while you are sleeping.
It’s fairly easy to imagine how this can induce panic, especially if this happens while you are vacationing in an unfamiliar territory. You’re not sure what kind of insect literally got into you, and you would want to get rid of it at the soonest possible time before it does any serious injury. If you have vaccinations, however, you can at least mitigate that concern of contracting diseases from a biting insect inside your ear.