Thanks ShockWave for your answer.

I have to aspects that still interest me:
1) Is there any known effect of being very tired. Is this correlated with lucid dreaming? Does lack of sleep in previous days increase the chance of complex dreams, of lucidity?

2) In lucid dreams, is it a common phenomenon to have anomalies such as recurring objects? In my case, when i was flying above a city, many of the houses had a sun-clock on their wall. First I just enjoyed seeing this nice golden sun-clocks, but then I realized that this is really not normal, that every third house should have a sun clock. I realized in the dream that that would not normally be the case, but I just enjoyed the nice looks of these things. Are such phenomenons common to lucid dreams (i mean anomalies in terms of too many objects)?

Thanks for hints/pointers

h34dbanger