How exposure to light in the evening affects mood and the circadian clock | Satchin Panda
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Modern environments interfere with normal brain signals that induce sleep. For example, daytime work environments are often low light, inducing sleepiness. But bright lights from televisions or shift work environments in the evening or nighttime impair the release of melatonin, a hormone that promotes sleep, inducing wakefulness. The end result is an upside-down sleep schedule in which circadian rhythms and gene expression in the body become desynchronized. In this clip, Dr. Satchin Panda describes the effects of inappropriate light signals and discusses strategies to mitigate their effects.
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A wavelength of light emitted from natural and electronic sources. Blue light exposure is associated with improved attention span, reaction time, and mood. However, exposure to blue light outside the normal daytime hours may suppress melatonin secretion, impairing sleep patterns. In addition, blue light contributes to digital eye strain and may increase risk of developing macular degeneration.
The body’s 24-hour cycles of biological, hormonal, and behavioral patterns. Circadian rhythms modulate a wide array of physiological processes, including the body’s production of hormones that regulate sleep, hunger, metabolism, and others, ultimately influencing body weight, performance, and susceptibility to disease. As much as 80 percent of gene expression in mammals is under circadian control, including genes in the brain, liver, and muscle.[1] Consequently, circadian rhythmicity may have profound implications for human healthspan.
- ^ Dkhissi-Benyahya, Ouria; Chang, Max; Mure, Ludovic S; Benegiamo, Giorgia; Panda, Satchidananda; Le, Hiep D., et al. (2018). Diurnal Transcriptome Atlas Of A Primate Across Major Neural And Peripheral Tissues Science 359, 6381.
The process in which information stored in DNA is converted into instructions for making proteins or other molecules. Gene expression is highly regulated. It allows a cell to respond to factors in its environment and involves two processes: transcription and translation. Gene expression can be turned on or off, or it can simply be increased or decreased.
A hormone that regulates the sleep-wake cycle in mammals. Melatonin is produced in the pineal gland of the brain and is involved in the expression of more than 500 genes. The greatest influence on melatonin secretion is light: Generally, melatonin levels are low during the day and high during the night. Interestingly, melatonin levels are elevated in blind people, potentially contributing to their decreased cancer risk.[1]
- ^ Feychting M; Osterlund B; Ahlbom A (1998). Reduced cancer incidence among the blind. Epidemiology 9, 5.
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Circadian rhythm News
- High-intensity exercise in the evening may be associated with greater reductions of the hunger stimulating hormones
- Time-restricted eating prevented obesity and metabolic syndrome in mice with mutations in genes regulating the circadian clocks.
- Caffeine that was given to people 3 hours before normal bedtime caused a 40-minute shift in the body's internal clock.
- After exposure to daytime bright light (6.5 hours), evening use of a tablet for two hours did not affect sleep in healthy young students.
- Acid Suspends the Circadian Clock in Hypoxia through Inhibition of mTOR. - PubMed - NCBI
