Timer technique for Astral Projection?

Has anyone tried this method? http://www.lucidology.com/blog/91/lucid-dream-timer-method/ I tried and used my phone timer & turned off snooze but I don't think your supposed to move at all. & I couldn't fall asleep :/ I think I have to stay up for 45min-1 hour next time after waking up 4-5hours after sleeping.. anyways I'll try this again and try to find a timer but has anyone else tried this??