Programming after 9 (your brain can't stop) and taking an extra nap will affect your sleep cycle. I go to sleep when I feel sleepy, usually it's around 12:30AM

Programming after 9 (your brain can't stop) and taking an extra nap will affect your sleep cycle. I go to sleep when I feel sleepy, usually it's around 12:30AM. If it is weekday, I wake up at 8:15am. If it is weekend, I wake up at around 9:30am. I still feel tired on the whole day but that doesn't stop me to be productive. I think I feel tired because I get some pressures in my life. My best productive hours is from 10:30am to 12:00am. I was productive in the night, but I stopped working in the night few years ago, because that affects my sleep cycle. I solved programming problems even in the dream.