how often are these spiders in your dream? a good dream sign I think is one that can be found in nearly any dream. My dream sign is a window. When I see a window in a dream, the sign is so powerful that if I were to stare at it long enough I am suddenly compelled to jump out, or in, depending if I am already outside or not.

my next dream sign, which is really just a giant window, are porch doors. since porch doors are glass, they serve a similiar function, I can see what is on the other side. I remember one dream where I was on a higher level and I can see the floor below me. On the floor below me was a porch. It was night outside, and the lights were off on the lower level. The entire dream was boring as hell!! And I stopped to look at the porch. It was creepy. So dark outside, so still. My friends were by an elevator yelling at me to hurry up, we were supposed to go to class.

I was compelled to go outside the porch, but I thought just maybe - this is reality and I'm going to get hurt. But then I realized the more I thought about flying out the porch that I could never in my real life even begin to attempt this. For one, I'm afraid of heights. Two, I'm afraid of getting hurt. Three, I'm afraid of the dark unless its my own bedroom! And four, I have shitty balance. How could I be standing on a thin hand rail without struggle, thinking about jumping at least fifteen feet below me onto a floor that no one else is on, with all the lights off, and running outside the porch late at night, unless it is a dream

I think this is how a good dream sign should be.

I think for your spiders to be a good dream sign it needs to show up often enough, at the least every other night. Otherwise I suggest looking for another dream sign. Also, when you do go lucid - pay extra attention to how it was triggered. As that could be a clue as to what your real dream sign should be. For example, when I first started lucid dreaming, I jumped out my bedroom window to start flying. Thats why the window imagery became such a strong trigger. Once you have found your dream sign and recognize it, the trigger will grow stronger and stronger!

I'm not sure about programming a dream sign. You need to be careful. You dont want to choose something that doesnt show up in your dreams often enough right?