What time of day is best to tke Mag.. I have been taking it at night. But I want my BF to start taking it, he has so many signs of deficiencys, Is it ok to take at dinner time.

He has insomnia so bad. I am hoping this helps.
Would it be good to for him to take D3 and how much.

1- he smokes
2- he eats as healthy as me, but eats dark chocolate daily.
3- is spine is ravegged with a birth defect, the lower never fused, and then he has rods supporting his middle spine, his neck is fused.
Would D3 help save the (anything) and help the pain he has?

I also was wondering, would MY B's vitamins be good for him to.

Thanks for the help