Our pillow cases always seem cold and clammy with room temp at 68 F, and as we head toward winter become even more so which is uncomfortable. Same with sheets. Not sure the material but they are common sheets at a moderate price range, nothing fancy.
What material in pillowcases especially, and also sheets, will be closer to warm than cold/clammy, and be good for all year use in 4 season state (NY)?
Packaging said 100% Egyptian cotton, didn't think to read the labels until after I washed them, which meant B, B and Beyond wouldn't take them back. Even though they weren't what the package said.
Just a heads up.
If you want something even warmer, consider using cotton or wool batting and make a quilted pillowcase. It's slow, and sometimes tedious, but it'll keep someone's head warm.
Your question raised some thoughts... I made comforters for my parents, and duvets to enclose them, for their traveling trips during the winter. You could do that as well with a quilted pillowcase: cover it with a PURE flannel (not the Chinese junk flannel) to add extra warmth. I also started quilted mittens (but never finished them).
Flannette pillowcases will be softer and warmer.
But I have to ask, what type of pillows do you have? Do you have waterproof or mite proof protectors on them? Dad put waterproof mattress covers on the beds in the cabin and they were terrible.
If I were to keep the temp @ 68 F, that just seems to be about 2-3 degrees too cold for winter.
Adjust the humidity in the room, that may help.