If you had been dreaming of exhaustion, it can be a message about your tired body. If you were suffering from fatigue during the day, you might dream about being exhausted.
If you go to bed in a physically tired state, you might feel as though you are falling down a depth or height. This feeling comes just when you close your eyes to fall asleep. The feeling of falling could be due to your tired state, and your transition into another dimension to rest.
However, dreaming about exhaustion can also mean you should recharge your energy because you need it.