I keep my spiral notebook next to my computer, and frequently refer to it while I'm writing. Sometimes I also have notes that I've printed or written on scrap paper stacked on top of that notebook, and I flip back and forth between loose and bound pages to get the info I need. This system works quite well for me.
Since I do about as much longhand as writing on the computer, I often have to type up whatever I've done by hand.
Which means I need to be able to see what I've written.
In related news, I'm a total softy when it comes to cats.
Especially sleeping cats.
It's a wonder I get anything done.