My mum always used to make my bed with at least a soft brushed cotton sheet (or at one point a sheepskin type thing) under the sheet. Made it comfier I recall.
My children have just recently gone from cot beds into single beds and the new mattress feels rather hard and cold.
I realise I may sound PFB but I was also wondering about putting something on ours too, so it's maybe just my preference.
Just wondered if there was a consensus out there on what people generally do these days.