You can't exterminate an ant colony just by killing the ants you see.
An ant infestation in your bedroom is a nuisance, and if you have one you won't stop it by killing the ants you see. To completely eliminate an infestation, you have to destroy the nests and kill the queens. Nests are almost always hidden, and while you may be able to find the general location of one by following the ant trail to its source, pinpointing its exact location can be difficult. A more effective extermination strategy is to feed the ants poison so they can take it to the nest themselves and feed it to the queen.
Instructions
1. Identify the ant species. Collect two or three adults in a plastic bag and either compare them to pictures in a book or on the Internet, or take them to an extermination expert in your locality. Different species have different food preferences, and knowing the species will help you choose an effective bait.
2. Remove all sources of food from the bedroom to which the ants are attracted, but do not disturb the ant trail.
3. Place a container of ant bait next to the trail near the food source to which the ants were attracted. If you have a large infestation, place one or more containers along the trail at strategic locations.
4. Allow the ants to congregate around the bait, but do not spray them. If you kill the ants that are eating the bait, you'll prevent them from taking it back to the nest and feeding it to the rest of the colony and the queen.
5. Caulk the baseboards or floorboards from which the ants were emerging after the infestation subsides to prevent further infestations.
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