Working with targets makes you tired. Or do you feel you don't need to rest before the target is reached? The body has limitations. By forcing yourself will make the body can not stand. What happened was exhaustion. Fatigue will reduce productivity. This is a law of nature.
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Setting a target is okay but achieving it must also adjust to the physical limitations you have. When you have written down the target you want to achieve, and you have done what must be done that day, then stop when it is time to rest or your body feels tired.
What you wrote down and what you did as a first step has worked. You don't have to be afraid that you won't reach your goal when you've written everything down. the power of your mind continues to work even though your physical rest. Take a break and let your notes work even when you are sleeping.