I never knew about these critters until it was too late.
Now I check the reviews for all hotels prior and then check the mattress etc after I check in (before I unpack).
It’s a damn shame.
Sadly, they don’t come to the mattress until you’re in it. The most elusive thing about bedbugs is they hide somewhere else, wait till you’re asleep, march over to your bed and attack. The secret is to find their nest.