Sore Throat

I always wear masks and wash my hands to protect myself from catching a cold. However, after I returned home from work, I was a bit tired and felt sleepy. I thought that I should take a rest, so I took a nap for a while on the couch. When I woke up after a short sleep, I noticed that I have a sore throat. Surely, I felt something wrong with my throat when I was at the office. I think I should take some medicine and go to bed earlier than usual tonight.