Even in the summer, I can get mighty cold.
What do people use to protect their head in bed?
In the winter months, I wear a hoodie sweatshirt to bed. If my head gets cold, just pull the hood on!
I keep a toke on my bedpost just in case I get chilly.
I have grown to love the cold feel, I do not even notice it now. But I do live in the South, so it may be easier here.
I notice it more when I have done a particularly close headshave.