I always wear a helmet. And I mean always. I'm wearing one right now. I even wear it in the shower, though I do take it off to wash my hair/face. However, when I do remove the helmet, I make sure I'm at my lowest potential energy state possible which (due to lack of space in my bathtub) is usually sitting indian style, leaning slightly forward. I do wear it in bed. It's actually quite comfortable. I alternate between a full motorcycle helmet and a football helmet. I found that the visor of the motorcycle helmet plus additional obstruction of my face was leading to many social inconveniences. For one, it made conversations difficult as my voice was muffled and the lack of facial expression made it hard to display emotion. I felt the tradeoff between communication and exposure to flying particulate hazards to be acceptable.