The act of covering your head might result in scabbing and swelling, which can make the transplanted region more susceptible to infection. Maintain a clean and dry environment in the region that was transplanted until the scabs have fully come off. You should stay out of the sun for a week and then start using sunscreen with an SPF of at least 30 if you are going to be outdoors for extended periods during hair transplant recovery Visit here: https://lahairinstitute.com/how-long-does-it-take-to-recover-from-a-hair-transplant/