Usually I feel great all the time--sharp and focused with tremendous energy. But once in a while, for no real apparent reason, there'll be a few days where I feel very foggy and spaced out. There's a term called sleep inertia which is the feeling of grogginess after awakening which can temporarily reduce your ability to perform even simple tasks. It usually lasts for 15-30 minutes. I'm sure everyone is familiar with it, but the "fogginess" that I speak about lasts the whole day, mostly several days, not just after I wake up. I almost feel high--almost "stuck", but not as severe. And then, as quickly as it came, it'll go away a few days later. This happens maybe every few months.
Does it happen to anyone else? If so, any way of getting rid of it quickly?