Making the story of 'The Forever Sleep: Vol. 1'

When making the first book of 'The Forever Sleep: Vol. 1', I thought... What would it be like, living in a dystopian future where the elixir of sleeping forever in a tank was a main point, but with a twist? Four different main characters with different status's with different risks at hand, what do they do when they've crossed paths?

My fiancé always had a saying, "I'm going to commit the Forever Sleep" and that's when ideas began to flood in.