@NewBeginning I've been bitten on four separate caminos. But the last one I was fine. It was early spring, and I think that is an advantage, because many of the albergues are closed during the winter and get cleaned then, also the bbs are less active in cold weather, and also because - as you will see under - I can wear clothing at night which may act as a mechanical barrier.
This is what I did - it might give you some ideas. Firstly I permethrined my pack and my sleeping bag, before I left home. Not a preventive, but hopefully it helps to kill any bugs that try to hitch-hike (not assured, but better than nothing).
Every night I slept inside my silk sleeping bag liner. Without exception. Even in good hotels. Mine is extra long, with stretch panels down the side, and I had inserted elastic around the top (loosely) - so I could pull it closed. The stretchy panels meant that I could move inside more easily - I also hate that feeling of confinement that comes with a normal liner bag. FYI it is a Sea to Summit -
like this. It was sufficiently long that I could easily pull it over my head, which I frequently did. I also wore long johns and long sleeved tops every night. Tucked into each other. And socks - amusing considering I rarely wear them during the day. That meant the only bits of skin that could be exposed were my hands, my face, and my neck - if I had my head out of the liner. I used DEET on those bits of skin - an 80% cream that I've only found in Australia - you rub a bit between your palms and then swipe your palms over the skin you are trying to protect. Not a spray.
I've become a big fan of ultra-sil dry-bags to separate clothes and sleeping gear. When I arrive at my nights accommodation, I immediately but my backpack inside a very large ultra-sil dry-bag (it is actually a liner for a 70 litre backpack and my 30litre backpack fits easily inside). It's much tougher than a garbage bag and does not rustle. It is also treated with permethrin. That dry bag gets sealed up once I've taken out the things I need for the night (in a smaller dry bag). My sleeping gear has its own dry-bag, and goes back into that in the morning, before going into my pack.
Obviously I can't be sure that the measures I took made the slightest difference. It may be that I was simply lucky. But I'll be doing the same thing again next Camino.