What I know about Hypnagogia from reading Stephen LaBerge's book is that it is the transition from awake to sleep, and sleep to awake. I'm trying WILD now, and a lot of the techniques tell me to observe the Hypnagogic hallucinations, such as light and other shapes created by the state. But I don't really understand what they look like, so I find it hard to determine if it is hallucinations, or just my imagination creating light and other shapes in my minds eye. Does anyone have ways of determining hypnagogia from imagining things?