I'm also an atheist myself and don't believe in God or religion. I have a hard time trying to cry myself, sometimes I force myself to cry, but no tears come out yet I still feel gloom and misery all around. I guess when things really hit hard, then I would "naturally" cry.
As for going to bed, I often just try to let my mind wander far away and then eventually drift into sleep and fall asleep.
@TiredHorse I don't recommend wasting time or energy to convert to a religion. Personally, I don't believe there is enough evidence (let alone strong evidence) that directly points to that there is a God or that when certain things happen it is necessarily caused by God.