I generally use a really light bivy bag to protect and keep my down sleeping bag dry. It also has a bug net. I wear a baseball cap to keep the mesh off of my face. Mine is made by TiGoat. I also used one for years from Black diamond - the twilight Bivy. But if you are into creating a nest inside a shelter then Mountain Laurel Designs makes a really good one. My kids love it set up inside our teepees - they HATE spiders.

The nest link - https://mountainlaureldesigns.com/product/bug-bivy-2/

The TiGoat Bivy - http://www.titaniumgoat.com/Bivy.html

Patrick