Take a deep breath &8212; these air purifiers are all on sale this week

At best, that scratchy feeling in the back of your throat or the constant sniffle you have in the middle of the night wakes you up only momentarily. At worst, it keeps you wide awake for a full eight hours. Either way, your sleeping patterns are being interrupted by symptoms that could, in theory, be resolved with one simple device.

The solution is the humble air purifier. As the name suggests, these devices remove airborne particles — dust, bacteria, pollen, and otherwise — from the air that you breathe, allowing airflow to remain active and cutting down on allergy symptoms that could keep you up.  Read more...