Definitely night. I don't feel like I wake up until it starts to get dark out, then I come to life. Daytime is a lot of distracting/annoying hustle and bustle, and responsibilities pop up everywhere. Night time, everyone shuts up and leaves each other alone, so I don't feel like anyones tugging at me.
I have wondered if it has something to do with my enneagram type at times. I don't like the business of the day because its all too much to take in. At night, everythings obscured and theres nothing much even illuminated as it is by the light of day.
My senses become more keen, and I actually feel like going outside and jogging, walking, exploring. My thoughts feel more clear and focused.
My eyes are also sensitive, and I hate bright light.
The mystery of it which someone already mentioned plays a part too. It feels like something interesting could happen.
Daytime, I feel pretty grumpy and just want everyone out of my face.