This is what I expected, actually. At night you know that nothing is going to happen, nobody is going to call, and nobody is waiting for you to do anything, because they are sleeping. I wonder if this connection between anxiety and sleep patterns has been explored; not the usual "anxiety keeps you up at night", where you're lying in bed worrying, but "anxiety makes you want to stay up at night", where you're staying up and finally relaxing.
Some clinically blind people with no eye damage do maintain the ability to distinguish between light and dark, that's due to certain cells in the cornea which are light sensitive and still maintain a neural connection to the brain.
People who are legally blind say a really bad case of cataract sill have light vision and usually can identify shapes and see a very very blurry and narrow image of their environment but those are not clinically blind.
I do indeed prefer the night hours, however I am often up during the day. I enjoy the mornings, but only when I've been up all night. I don't enjoy the morning if I've slept then gotten up early.
I'm pretty sure I have quite an advanced case of Delayed Sleep Phase Syndrome. DSPS is an endocrine condition that has to do with when the pineal gland secretes melatonin, or does not. Melatonin production is cyclic, with the cycle being mostly but not all the way synchronized by exposure to light.
In my case my sleeping and waking hours are so irregular that I may actually have "free-running non-24-hour delayed sleep phase syndrome". However that particular kind is thought to occur only among those who are profoundly blind. Most blind people can sense the presence or absence of light, but a very few have no perception of it at all.
My preference for the night, I expect, has mostly to do with it being the time that I have the most peace of mind. There is something about daylight that makes me anxious. I can't really explain why.