Should you wash sheets alone?

Yes, putting them in the washing machine with your clothes is a bad idea. Throwing a set of sheets with a tiny load of clothing and a green laundry pod would only prevent the garments from washing and drying properly due to its huge size. The clothes would become twisted in the sheets and would not be able to be washed properly. Instead, laundry service washes because they wouldn't stir against other clothes. 

In the dryer, the same thing happens. If you wash bed sheets in with your garments, the drying time will significantly increase. It is because clothes would not dry properly. After all, they'd be stuck between the sheets.