A normal, restful state is when you are in a safe, predictable situation. But when a threat presents itself in your environment your body responds with physiological changes to protect itself. It is a biochemical release such as producing adrenaline to assist either running or fighting. It is an emotional stress reaction which includes cortisol being secreted by the adrenal glands to stimulate brain activity. Chronic stress can create excessive, regular tension thereby depleting important chemicals. Then unnecessarily low levels of biochemicals can result in reduced, inadequate functioning.
If cognition is to know then you must use your mind to understand. When you become "a new creature . . . new things have come" (2Co 5:17). But you seem to still think and learn the way you did before. However, you used to conform "to the pattern of this world" (Ro 12:2) and your mind was on "earthly things" (Col 3:2). At that time "the mind of sinful man is death . . . and hostile to God" (Ro 8:6-7). To make the transition make sure your "mind is steadfast, because he trusts you" (Isa 26:3). You now "set your minds on things above" (Col 3:2) and are "transformed by the renewing of your mind" (Ro 12:2). You will now "be able to test and approve what God's will is" (:2). "The mind controlled by the Spirit is life and peace" (8:6) and God will keep you "in perfect peace" (Isa 26:3).