Also, what are you thinking about when you're lying there? If you're singing in your head and talking to yourself, etc. then you'll have a really hard time getting to SP. You have to relax. Focus on your breathing or something. That always helps me.
I do the "one- I will be dreaming" type of thing, and when I do that and focus entirely on that it seems to relax me + I begin to white dots, but how long do you do it for? When do you know when to stop focusing on breathing and work on trying to devolop the white lights?