Dementors feed on the hope and happiness of the person, and it is possible to fend them off with the Patronus spell. Riddikulus and Patronus are the spells that require high focus.
While the soul-absorbers are fed by the hope and happiness of the person, it is also possible for the person's memory to be filled with bad memories or even the existence of unconscious fears.
Both intense sadness, stress and drowsiness are confronted with the mood absorber. Harry had the same feeling when he saw a booster because he had previously experienced a state of depression, and could not complete the spell and remain vulnerable.
Unconscious, simply, if you remember the area that was able to direct behavior and thought but could not be reached voluntarily. In this context, Harry struggled to cope with not just a boggle or fear, but with all the fear and grief he felt, the feeling that his hope had disappeared, and he lost the battle because he was not ready for it.
Students and Lupin'in against the level of consciousness of the populace, because of the soul-absorbing form, Harry's face, including all the levels of consciousness is out.
J.K. While Rowling has not made a clear statement, many articles in which soul absorbers represent major depression, are roaming the Internet with sound infrastructures. When you think about the effects of the soul-absorbers and then the person they left behind, you support this idea immediately.
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