Doing a side project (open source) is what keeps me up at night. I don't know why, I just push hard myself at least there is one commit a day. Beside that, I think random things a lot. I always waste my night to think about it rather than plan or take an action.

I worry about my health. My sleep time is decrease. I have to wake up in the morning and then go to office. When my sleep time is not enough, I wouldn't focus. I lose my valuable time for starting my day, like exercise and meditation. I heard that would be a problem if you don't have enough sleep.