don't fall asleep. You don't even need to run to achieve them -- about 42 hours should be enough to experience them without any exercise at all. The only trick is every time you get tired -- push through it and wake yourself up with movement or music. After pushing through the exhaustion you'll get a 'second wind' of awareness -- and a third and so on, as those later exhaustions occur.
The goal isn't to be at 100% awareness during these moments -- it's to not micro-nap and relieve the lack of sleep.
I remember once playing a game of go with a friend after 40 hours of no sleep (drug-free), and seeing purple electricity radiating across the stones and outlining the boundaries of their activities against one another. Walking down the hallway I experienced that recession of reality like when Frodo first encounters the Nazgûl in the forest and the path pulls away from him.
Lack of sleep is incredibly psychedelic. Take this from someone who has done many -- and good luck ;)