This past weekend, I attended a scientific meeting in New York. As often seems to happen to me in a hotel, I tossed and turned and woke up feeling not very rested. The second night I did a bit better. Why is this? Using advanced neuroimaging techniques to study volunteers in a sleep lab, NIH-funded researchers have come up with a biological explanation for this phenomenon, known as “the first-night effect.”
As it turns out, the first night when a person goes to sleep in a new place, a portion of the left hemisphere of his or her brain remains unusually active, apparently to stay alert for any signs of danger. The new findings not only provide important insights into the function of the human brain, they also suggest methods to prevent the first-night effect and thereby help travelers like me in our ongoing quest to get a good night’s sleep.
Tags: brain, brain activity, brain waves, default mode network, disturbed sleep, DMN, first night effect, fMRI, magnetoencephalography, MEG, neural network, neuroimaging, neurology, neuroscience, night watch, perceptual learning, sleep, sleep disturbances, sleep lab, sleep research, sleep stages, slow-wave brain activity, TMS, transcranial magnetic stimulation, travel
Credit: Kraemer et al. eLife 2015;4:e08347
For decades, the mosquito-transmitted Zika virus was mainly seen in equatorial regions of Africa and Asia, where it caused a mild, flu-like illness and rash in some people. About 10 years ago, the picture began to expand with the appearance of Zika outbreaks in the Pacific islands. Then, last spring, Zika popped up in South America, where it has so far infected more than 1 million Brazilians and been tentatively linked to a steep increase in the number of babies born with microcephaly, a very serious condition characterized by a small head and brain . And Zika’s disturbing march may not stop there.
In a new study in the journal The Lancet, infectious disease modelers calculate that Zika virus has the potential to spread across warmer and wetter parts of the Western Hemisphere as local mosquitoes pick up the virus from infected travelers and then spread the virus to other people . The study suggests that Zika virus could eventually reach regions of the United States in which 60 percent of our population lives. This highlights the need for NIH and its partners in the public and private sectors to intensify research on Zika virus and to look for new ways to treat the disease and prevent its spread.
Tags: Aedes aegypti, Aedes albopictus, Aedes mosquitoes, Asian tiger mosquitoes, birth defects, Brazil, chikungunya, child health, climate, dengue, disease control, disease prevention, disease transmission, epidemic, global health, Guillain-Barré syndrome, infectious disease, microcephaly, mosquito, pediatrics, pregnancy, travel, virology, virus, yellow fever mosquitoes, Zika, Zika virus