One thing that helps is headphones, both to block out physical surroundings and as a focus of attention.
But especially that first night I needed something conrete. I needed familiarity but also engagement. For a while I tried being in my bathroom at home, but I think it was either too boring or not believeable. Eventually I found something that worked.
Now whenever I go to the gent's at La Hacienda I remember trying to pee into a bottle at the emergency ward.