I had bed bugs a 15 year ago while living in Bahrain. I had never heard of them or had any idea about what they were (in Italy, where I am from, they are not common at all) so when i started to notice bites all over my legs i did not know what i was facing. But: my sleep quality deteriorated, and with it my personal well being. So while it might be true that they do not bear diseases, if not taken care of they can severely affect your health anyway