Tiny insects in my bathroom that have Y shaped antenna and jump also whn you get close to them. what are they?

i have tiny little insects in my bathroom sink that does not go away no mtter what i do. i have used liquid plumber down the drain. i kill them every time i go to the bathroom and look at my sink. They seem to be crawling out of the sink drain or the tiny hole located in the sink for the water run off...not sure where they are coming from but they are. they also jump when you get close to them to kill them and they dont die from water if i just wash them down the sink. it seems as though they live in the drain area. how do i kill them permanently? and what are they? can anyone please help me with this problem? thank you.