The following questions might pop up in your mind from time to time:
And it's pretty reasonable to track such activities like changing bed sheets or pillows, as they improve the quality of your sleep.
Most experts recommend replacing them every week. It depends on different conditions and you’re the best person to decide on cadence, but about 90% of people do this on weekly basis.
To free up your brain you can use Tracktions to track this.
Starting from now you don't need to remember when was the last time you replaced bed sheets. Simply open the application and it will tell you.
As soon as you change bed sheets again, reset a timer from the main screen by simply swiping to the left.
Hint: you can set up a daily reminder in the application's settings, so you never miss some routines that you need to do.