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Pitch Black Sleep

Meaning

A stringent environmental condition for sleep where the sleeping space is rendered completely dark, eliminating all sources of light, including minimal ambient light from digital displays or streetlights, to ensure maximal physiological production of the hormone melatonin. This practice of extreme light hygiene is critical because even very low levels of light exposure, particularly in the blue-green spectrum, can suppress melatonin secretion and disrupt the phase of the circadian rhythm. Achieving pitch black sleep is a powerful non-pharmacological strategy for optimizing restorative sleep and hormonal signaling.