Ah yes, I know what you mean. I'd use all the hours I could at night to do things at peace knowing that everybody was in bed and nobody would bother me. Unfortunately, I also had to wake up quite early, so I'd spend my days tired and sleepy. Back then I was still in school so things were more or less okay since I had good grades, didn't need to study and could nod off there. That still didn't make me feel better, since I didn't particularly enjoyed leaving my house for so long.
Now that I'm on college I need to study more, so I find it difficult to give my nighttime to physics and math. That's why I started studying in the mornings and using the night to relax, which also includes more sleeping. Somehow, having to go through long periods of time using your brain does really strain you enough mentally to make you rather sleepy at night. It's a good thing I can sleep more or less after a few minutes of being in the bed now, contrary to the past when I could go for hours just looking at the ceiling no matter how tired I felt.