Jumping on this to add that OP should vacuum their mattress and make it part of their weekly sheet change routine. Also adding a hypoallergenic mattress cover, which they wash with the sheets will stop/cut down on the dust migration both into and out of the mattress.

Same for pillows. Although pillows can be washed whole, I only ever do that when I'm willing to say goodbye to it anyway, because some turn out a lumpy mess.