I have brain fog that affects cognition and cognitive clarity. Sometimes it is difficult to put 2 and 2 together, problem solving is a problem, perception seems to have a sticky veneer of haze attached to it, reading and comprehension are greatly diminished from previous norms, abstraction seems thwarted, there is a general dullness to the world, memory is poor, and thought seems blurred or blunted. But sometimes I have dreams that are crisp and clear as a spring morning. They seem like the antitheses of all mentioned above. Things seem normal, not exuberant, or excessively vivid, just kind of how I remember the noggin working before the brain fog. Perhaps, in analogy, as if spraying Febreze in a musty room. It seems that there is some interesting neurochemistry or neuronal activation going on there, and it seems that if it is going on in my sleep that it should be able to be replicated during waking states. Wonder if anyone else has experienced this and may have an explanation for it.