http://www.dreamviews.com/forum/viewtopic.php?t=6507

that thread answers your questions about how much to take and the effects of too much. I think you're way under. I'm guessing 150mg is the entire bottle, so each pill is much less than that. If each pill is 150mg, that's a pretty big pill...

I'd suggest you need to drink more water, dehydration effects the colour of your pee. Perhaps you're getting dehydrated overnight.

I don't know why B6 would change the colour like that, maybe its making you sweat more or use more water during the night. when you're sure you're taking the right amount, if its still a really yellow colour then try drinking more water.

if that doesn't seem to work, then i'm not sure what you should do. good luck!