How can I get rid of these small tiny flies?

I dont know where they come from but i'm thinking they come from the bathroom.....I moved into this room about 2 months ago and ever since the start i've seen them everywhere, mostly in the bathroom. they are black and very small, and very weak. many of them fall and die on the sink and ground. How... show more I dont know where they come from but i'm thinking they come from the bathroom.....I moved into this room about 2 months ago and ever since the start i've seen them everywhere, mostly in the bathroom.

they are black and very small, and very weak. many of them fall and die on the sink and ground.

How do i get rid of them?

thank you
Update: hmmm, no plants in there and i dont leave food out either
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