The littlest issues caused me great stress. I felt as though I were running a marathon every day when in reality, I rarely ran at all. The daily marathon of life became harder to sustain as I became more depleted.

Simply put, your circadian rhythm is your body's internal clock. Operating on a roughly 24-hour cycle, it governs our sleep-wake cycle and plays a large part in everything from hormone release to body temperature.

Today, people talk freely about their adrenal glands being shot or fatigued, and there is growing industry of supplements called adrenal tonics. Meanwhile, conventional doctors claim there is no such thing as adrenal fatigue.