Don’t aim for ending whatever sense of fatigue you have at the moment. Aim for ending the state of being unable to do what you want.

Look for regaining of ability. If you’re trying to rest because you’re tired only, you will not rest frequently or long enough. You’ve learned to push yourself through fatigue anyway at some point in your adult life. Being tired is not reason enough for you to rest anymore. You need bigger motivation than that. Aim at regaining your ability to do anything instead. You might have noticed that you are no longer able to do some things as good as you know you’re normally capable of. That is a sign that shouldn’t be ignored. Why are you struggling with decision-making or executive functioning for example. Why can’t you think about any of your problems, not just trying to find a solution to any of them, but the problems themselves, you can’t even mention them to yourself. You can’t think about anything. You cannot visualize, imagine, or desire anything. You can’t control yourself or regulate your negative emotions. You can’t read. You can’t learn. You can’t get yourself to concentrate or focus on anything. You cannot sustain yourself. You’re not getting any creative ideas and you can’t get yourself to create anything or work on anything that requires creativity. These are just examples of what it means to be unable to do things that you are normally capable of doing, but now you’re too tired to do or even think of doing anything, whether what you can’t do currently because of fatigue is mental or physical. It makes sense in this case to organize rest around moments of that kind of loss of ability, including anything that could be described as one of your abilities, whatever it is. Because if you said I’ll only rest when I feel tired, good luck with that, it will never happen. You will think that the problem is with feeling tired, and then you’d just stop feeling tired or allowing yourself to feel tired, because it’s stopping you from living. If the problem is with a feeling, then you can always short-circuit the solution by attacking the feeling itself instead of attacking its causes. And what are you going to do to attack the causes of getting tired? Stop doing anything that can get you tired? You’ll stop doing countless things that you want or love to do because of that, and life will be incredibly boring and unmotivating because of that. You’ll stop doing anything mentally or physically challenging or difficult for the rest of your life just to avoid getting tired ever again? Doubtful. Which means settling for getting rid of feeling tired would be the easier solution for you. Which means you’ll keep pushing yourself to do anything or to keep going anyway despite feeling incredibly tired. Also you sleep at the end of the day anyway because of fatigue, so why would you stop yourself from doing anything during your waking hours for the same reason? It would seem like a colossal waste of time in this case. And you have nothing to say against fatigue or feeling tired being just an obstacle, just an unpleasant and an unnecessary feeling that is slowing you down from enjoying your life to the fullest unchecked, so you need to no longer succumb to it or what it entails. You have nothing against that argument. Also you’re getting stronger, so who says you are allowed to get or feel tired at all in the first place. But loss of ability? I’m sure all your current problems and struggles are because of that. If you could get yourself to do what you know you’re normally capable of, you’d overcome whatever problems or struggles you currently have, easily.

Organize your rest around loss of ability. It’s far easier, better, and more practical than Organizing it around fatigue or exhaustion. You know what abilities you’re currently missing because of exhaustion. You’ll be able to convince yourself that it is time to rest more in this case. You want your ability back.