Do blind people cry?

Yes! And even if they lost or severely damaged part of their eye/eyes, as long as the tear duct remained safe or intact then they can still produce tears.

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Can you dream things you've never seen?

But have you ever had a dream with a person in it whom you have never seen before in your life? It may seem that way, but it is impossible. Even those whom you do not consciously notice but still look at as you pass by may be an implanted image in your brain and show up later when you are dreaming. And another question, can you feel pain in dreams? The results indicate that although pain is rare in dreams, it is nevertheless compatible with the representational code of dreaming. Further, the association of pain with dream content may implicate brainstem and limbic centers in the regulation of painful stimuli during REM sleep.

Why are my dreams so dark?

Dark dreams can happen due to depression or what you might be exposing yourself to like dark movies or video games. Depending on the vividness, and from what you say they are very vivid, they can seem real and depending how deep you are involved in the dreams, it could be hard to wake up from. One may also ask how long is 1 second in a dream? In other words, each second in the real world takes almost six hours in limbo. Each hour in the real world would take two years and four months in the dream state. This is how Nolan set it up, but...

How long can a dream feel?

Yes. Most dreams only last about 10 minutes on average (give or take a few minutes), but inside the dream itself it often feels, subjectively, like much more time has passed. Some parts of the brain which are responsible for our logic and reasoning are suppressed when we dream.