In the cold winter months or even during allergy season, the lack of moisture in the air can cause dry skin, cracked lips, and even itchy eyes. Luckily, you don't have to endure it without help.Using a portable humidifier in your bedroom at home is an easy and affordable fix, adding a little extra moisture to the atmosphere while you sleep, but these portalbe humidifiers can also be moved around anywhere to help boost your humidity level throughout the day. Some humidifiers can actually purify the air, too.