Is it important to disinfect my headphones if i used them while i was sick?

Probably: Depending upon the illness that one has, viruses and bacteria can contaminate headphones by direct contact with the hands or by sneezing or coughing on them. It would be prudent to use an appropriate cleansing agent on the phone prior to other's use. Check with your product recommendations. Usually soap and water on a damp cloth, an antibacterial wipe or some alcohol moistened cloth. Careful.