Lyric discussion by songmeaning1 

Cover art for Shadows lyrics by Midnight Juggernauts

War of the worlds-like alien invasion theory: I think this is part 2 (part 1 being 'intro')

They'll be hiding in your shadows They'll be hiding in the dark of the night They'll be hiding 'til tomorrow They'll be hiding 'til the timing is right

Talking about the aliens 'hiding in the shadows'. Just like the prologue of WotW. 'Dark of the night' means space.

It's an answer for the future It's the question that we left in the past It's a message for the masses It's a problem but it ain't gonna last

I think this is the aliens talking about taking over earth - 'it's an answer for the future'. The 'masses' are the humans. 'It's a problem but it ain't gonna last' talking about the fact that earth is already inhabited.

oo, you will give to me Tomorrow, tomorrow, tomorrow, tomorrow today

I think 'you will give it to me' means the earth. And 'tomorrow' is the invasion day.