How often should you wash your bedding?

EVERY MORNING WHEN LIBBEY Castle wakes up, she strips her bed and chucks her sheets into the washing machine.

- ANGELA HAUPT

It doesn't matter if it's a weekday or the weekend, if she has a light or a busy day ahead, if she slept well or tossed and turned all night. The sheets will be washed.

"I let them do their thing, and I go make coffee feeling happy," says Castle, 30, who lives in Washington, D.C. "Then I throw them into the dryer before I go work out. I come back, I grab a shower, and the sheets are done. I throw them on the bed, and then I start my day." Knowing fresh sheets await her boosts her spirits straight through to bedtime.