I was running low on disk space on my desktop today and was searching for things I could move or delete just to get me out of a trouble for the rest of the day. I found that Windows automatically created this as part of my power settings even though I don’t use Hibernate. Some further digging found this Microsoft KB article that showed me how to disable it.
I ran the fix to disable it and the hiberfil.sys file was gone. Love it Microsoft – nice and simple for sure.