What are these very small flying insects trying to take over our flat?

First I thought these are fruit flies but no, these aren't seem to be interested in our fruit basket. They are in the bathroom, kitchen, home office so basically everywhere. We have lots of plants but none are new and while these insect are around plants I didn't find any directly on the soil or on the plants either. In the morning I find a lot of dead/dying ones in the sink above the bathroom window