Like the Asian Ladybug and the Box Elder Bug these wee buggers like to overwinter in our houses and they often can be found coming out of the wall cavity and inside on warm, sunny days. Swatting any of these is not a good thing to do since they all can leave stains and two can leave a bad odor. Most people I know trap and flush them.
Most every web site that talks about these talks about things to do during the summer to keep them out of your house and that is too late now. Spraying any pesticide in an attempt to control them can cause more health problems for you and your family then it would these insects.

Here is a link that might be useful: About stink bugs

Wolverine, you need to investigate possible points of entry. For examples, we had a problem with ladybugs coming in the house a few years ago. Our windows were tight, but our doors weren't. New weather stripping on the back and side doors and a new storm door on the front ended their annual winter migration for good.

I found one wrapped up in a daddy long legs web inside the house. So that was a nice surprise!

Not a daddy longleg spider, as they don't make silk....but glad you have some sort of spider in your employ.

Rhizo_1,
Not surprising that you were assuming what arachnid Kim pa is referring to; however, I am confident she actually is referring to the true spider known also by the (to me) more appropriate name of cellar spider or house spider. It's true name is Pholcus phalangioides.

Daddy-long-legs or harvestman "spiders" are Opilione arachnids that, as you correctly noted, do not produce silk.

The crane fly also has been called by the name of daddy-long-legs, adding to the confusion even more!

Another instance of confusingly-the-same common names being used for totally different species of creatures, whether arachnid or plant, etc.and why it is often necessary to use scientific nomenclature!

Here is a link that might be useful: A cellar spider by any other name