I have never traveled the Camino in winter, only summer under the best of conditions for these critters. There really is NOTHING that can be preventative. I always slept on the top bunk while hubby took the bottom. I was the unfortunate one whom they induldged themselves with an unsparing feast! The thought of it happening was more horribly grotesque than the actual "experience", and yes, it was much itchier than mosquito bites. I took my own ointment/medicine from the U.S. which minimally gave relief. The Pharmacias in Spain however had the best ointment that relieved the itch. Enjoy your trip and as you live w/ the pain of walking, so you will endure any of the other discomforts the camino has. This was 2012. And now, here I go again in July 2014......same conditions, same route (Francis), but now, with less fear of getting bit by bed bugs. The life experiences you gain on the Camino are far MORE worth the fear of bed bugs. Have a joyous trip! Buen Camino!