Is it necessary to bring sheets when staying in a hotel outside?

This depends on personal needs. If you have cleanliness or something, you will definitely bring it. If not, I won't think about it. Anyway, I personally feel that the hotel is not very hygienic (? ; ︵; ), because I'm a little neat, but I won't stay in a hotel for a day or two, nor will I stay in a hotel for three or five days. Anyway, I have never encountered any permanent situation because I am afraid of trouble.