She's talking about letting F rule you and ignoring rationality. Fs do it all the time, and I think everyone does a bit.
Analagy Check it out.
Youve been working on a 1,500,000,000 piece 3D puzzle of the solar system and everything looks wonderfull. You are down to your last three peices but you keep checking over the puzzle and there are only two open holes. So you keep reasessing the puzzle and reassessing the puzzle. You try combinations of two of the last three pieces and not of them fit together. But there is the rest of the puzzle, minus the three that dont fit anywhere. You start to read the box, or think you make have gotten somewhere there were two identically cut pieces by chance, and you may have used the wrong one throwing the entire puzzle off. Every solutions nets the same result so finally you say. I can't do it because I am tired and not thinking clearly. So you dont allow your self to focus on the puzzle until you get rest. Which may be a while because now that you think its because your tired your not feeling tired anymore or never were or whatever. But you have shifted focus away from the puzzle which could have its own bennifitial elements to it rather than completion or perhaps the completeion will come from distance.
This is probably the first time I have tangibly allowed myself to not follow a thought through to completetion. And yes it feels like cheating. Noone has done this?