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Physiologically, this window aligns with the lowest point of our circadian rhythm. During these hours, the body is in its most vulnerable state: core body temperature drops to its minimum, blood pressure falls, and circulation slows significantly. Cortisol, the hormone that eventually surges to wake us up, is at its lowest baseline before it begins its gradual morning ascent. In this physiological lull, the body is deeply relaxed, yet the mind becomes hyper-sensitive to any disruption. A minor sound, a slight dip in blood sugar, or a single intrusive thought can jolt the system into full alertness. Because our energy reserves are at their lowest, the body struggles to transition back into deep sleep, leaving us stranded in a state of “early morning awakening.”
