Exhaustion and weariness dreams usually illustrate real life situations and refer to the fact that you may be overstressed, overworking on a regular basis and may need some time for yourself, to relax and repose. Therefore, an exhaustion dream may be interpreted as an advice to calm down and rest in order to gain and gather strength and energy.
Feeling exhausted in your dream may also mirror depression, debility, emotional problems in the waking life, therefore the fact that you feel emotionally drained and you no longer have the energy and resources to fight. However, try to release all negative energy which keeps you from evolving or achieving a general balance in your life and find in you the strength to go on.