If you are trying to wild at bed time or do astral projection, it may take a while to get to the REM stage. I guess this is why you say there is no dream forming. However, ther may be a little window of opportunity to have an ld even at bed time. Before deep sleep begins there is a short stage that resembles REM and you might be able to experience it.

While the best time to try for wild is after couple of hours of sleep (or naps), you can still experiment at bed time. It seems to work for some people, you come to know the early sleep cycles well and there is a lot of interesting stuff to explore there.