Generally I feel (certainly of late), that I read as much as I feasibly can ... considering.
As life has a way of interfering, even if it is just tiredness through being busy. Some nights or even afternoons, I only manage to read for a few minutes before nodding off. And some days I am just so tired, I don't bother to try at all.
Such is life, and short of taking drugs to stay awake (something I would not do), not much can be done about it, without somehow simplifying my life ... perhaps foolishly ... I mean, it is only reading after all, and life is about much more than that ... though for some, it rarely seems that way.
Age of course, has its impact. Certainly when I was much younger, I often stayed up to the wee hours, head buried in a good book ... then off I went to work. I was clearly much more resilient then, than I am now, at 60. I also have a more mature sense of priorities, obligations and responsibilities.