It's not due to not changing the bed sheets. I actually got bedbugs in a beautiful 4-star hotel in Philly a few years ago. The realization was horrifying, but it didn't end up being a traumatizing experience. The psychological impacts can be far worse than the physical ones, but the fact is that it's been 2 years and they haven't 'come back', so all in all you could say that I survived it..