A significant number of individuals sleep with a nightlight on or positioned near screens that emit a subtle glow. However, these seemingly innocuous sources harbor unseen risks extending beyond mere sleep disruption. Dr. Zheng Tianming, a sleep specialist from Koenig Hospital, pointed out that sleeping while illuminated can contribute to weight gain, substantiating this claim with research findings.
Light from a nightlight or bulb, penetrating the eyelids, stimulates photoreceptor cells within the retina. This process actively inhibits the synthesis of melatonin and adversely impacts the body’s metabolic capabilities. This effect was corroborated by tracking the habits of 43,000 women. Those who slumbered with any light source on, including a television, were 17% more likely to gain over 5 kg compared to those who favored sleeping in complete darkness. Furthermore, their chances of developing obesity rose by 22% and 33%, respectively.
Disruptions in melatonin production trigger feelings of fatigue in students and excessive drowsiness in older adults. For children who stay up late, melatonin secretion is stalled, preventing its levels from properly decreasing by morning. Conversely, the elderly typically go to bed early and frequently experience nocturnal awakenings.
To restore sound sleep patterns, experts advise increasing sun exposure in the morning or undergoing treatments in a light therapy booth. It is crucial to ensure the sleeping environment is completely darkened and to refrain from using electronic gadgets before bedtime.
Should you find it impossible to sleep without some illumination, opt for a red or orange nightlight; conversely, the blue light emitted by digital devices and energy-saving bulbs is the most potent suppressor of melatonin secretion among all light types.
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