You want to know, how it works? Ok, even when i don't know why you would want to go there, i will tell you.
First, have a bottle of wine. Don't make a celebration out of it. Just drink it.
Then, sit. Sit and slowly let the shadows come. They will sit in the corner, first they will look like cats. After a while, theywill grow bigger. Scarier. Theywill overlay the real world.
Then, you have to stand up and close your eyes: There, in front of you, will be the door. Walk through it an go all the way down, without stopping. If you stop, you will have failed and step out of the door again.
As i said, the last hundred steps will be in darkness. You will hear lots of things, people or worse. You will have to ignore them.
At last, there will be the door. Don't hesitate, just open it and step in. It will be a glaring light, you stand in. Just walk on, you're almost there. If the light becomes coldest an brightest you can stop. You're there. And unfortunately you will not come back, at least without a heavy headache, i guess.