How often do you wash mattress/pillow protectors?

[GADA9215]

I feel the need to do then regularly in the summer when it’s hot and sweaty but this time of year how often would you wash your mattress and pillow protectors?

We go to bed bathed with clean PJ’s every night. We don’t eat or drink in bed (other than water).

Also, how often do you vacuum your mattresses?

Not until someone's sick / wees on them

I do the pillow protectors every time I do bedding especially dh's as he has a sweaty head