My main distraction is work, and I can't really avoid it. My husband and I work from home and will often have so much work on that we don't have time to do anything else, except maybe read for an hour or so before going to sleep.
My husband can also be a distraction. I am unable to share my WIP until it's finished (otherwise the story stops feeling like mine and I can't continue to write), so whenever he enters the room when I'm writing, I have to hide it. This is a silly reflex. He knows my feelings about sharing WIP and would never peek over my shoulder to sneak a glance. But I still have to do it. And this interrupts the flow. Sometimes he'll come into the room and start talking to me without realising I'm writing. And usually I'm too nice to say 'Go away. I'm writing.' so that interrupts the flow, too.
Another distraction is the dog, who sometimes decides to bark out the window at people walking past, because he doesn't understand that the whole town isn't his territory. Or he's being particularly cute and therefore needs to be cuddled.
And, of course, the other big distraction is the Internet. I could have been actually writing, instead of reading and writing posts here. Actually, I couldn't, because I'm still not quite awake and have no creative energy when I've just got up, but in theory I could.
I am currently scanning the small ads in the local paper every week, looking for an old and cheap laptop that someone wants to sell. That way I could still write on the computer, but not be distracted by the Internet. I would also be able to write in a different environment to where I work, which I think would make me more productive. I could go sit in the spare room, or hide in the basement, or go to a cafe or the library. Yes, I know, that's what pen and paper are for, but I don't write very well with pen and paper. I type a lot faster than I write, for a start, and I tend to do a certain amount of minor editing as I'm actually writing, which isn't so easy on paper. Paper doesn't have Ctrl + Z, either. Or a built-in thesaurus.
How do I deal with these distractions? I don't. I wish I could, and hopefully one day I will manage it.