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Stink Bugs in home in winter

Can anyone suggest why we are finding stinkbug type insects in our Silver Spring, Maryland home in mid-winter? They are primarily in the master bedroom bathroom, near the sink. When a vaporizer was on at the other end of the bedroom, a couple of them turned up near to it. Looking for moisture? But, what would have been the source? Loose greens brought in from a market? A tree near the house? Any help in understanding this would be appreciated.

Invasive species to blame.
The insect you describe is most likely the "brown marmorated stink bug," Halyomorpha halys. Please see the guide page for more information. You should probably contact either your state department of agriculture, or the entomology department of the University of Maryland, College Park, to see if they are aware of populations of this exotic (Eurasian) import in Silver Spring. It is probably a redundant exercise (the marmorated stink bug is now turning up in Virginia, too), but you never know. It is simply a habit of this species to seek shelter en masse during the colder months, often on or inside human dwellings.

 
Brown marmorated stink bug in Maryland
FYI - the University of Maryland Home and Garden center told me that this insect is well reported in Montgomery County, and 'unfortunately, is here to stay'. They are tracking is, however, and welcome reports of it in Maryland.

 
Stink bugs in home in winter
Thanks to both of you who replied to my question. We will let U MD know about them - even have a couple of specimens to give them. As for weather conditions, ours have been extremely variable, hitting a high of 70+ two days ago after a fairly short stretch of very cold weather. More ups and downs are predicted.

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I've been working on an overwintering article here on BugGuide. And, in reading and researching I've learned a lot about insect habits during the winter. Some insects will come inside where it's warm. Lady beetles are notorious for doing this as are Boxelder bugs, Leaf-Footed bugs, scorpions, spiders, and various other critters. Most times we never know they're in the house because they might be in between the walls, attic, basement, in between cracks, etc. They become a problem though when they make it to the living room or whatever and that's when we notice them.
One of two things could be happening. If you have had a warm spell for a few days then this can cause them to come out of hibernation and roam around trying to get back outside. Or, it's warmer inside the house than in between the walls or where they were before and they're trying to get to the warmer spot.

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