Welcome XC!

You're no more likely to sleepwalk in a lucid dream than a normal dream. So unless that's been a problem for you in the past, you've nothing to worry about.

As for the B6, I think 50-100mg a night is a normal dose, but I know that some people use up to 3x that much. Just be careful with it and read up on it before trying any megadoses -- it can cause some problems if too much builds up in you system. Here is a reference I found:

Too much vitamin B6 can result in nerve damage to the arms and legs. This neuropathy is usually related to high intake of vitamin B6 from supplements, [28] and is reversible when supplementation is stopped. According to the Institute of Medicine, \"Several reports show sensory neuropathy at doses lower than 500 mg per day\" [12]. As previously mentioned, the Food and Nutrition Board of the Institute of Medicine has established an upper tolerable intake level (UL) for vitamin B6 of 100 mg per day for all adults [12]. \"As intake increases above the UL, the risk of adverse effects increases [12].\" [/b]
Glad to have you at DreamViews, and if you have any questions, please ask away.