Working all day makes the body and mind need a little rest to relax and restore the energy that has been lost while working.
The body may be tired, but the enthusiasm to keep trying will not fade because it has become our habit to seek experience and knowledge from the activities we do.
Letting go of fatigue for a moment will really relax the body and that's when the body will recharge with energy to be able to do activities again later. Feeling tired is not an obstacle to not doing anything, but you must remain enthusiastic about doing everything for a beautiful goal later.