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- Mystery Meteorite: The case for (and against) a rock from Mercury
- Hard Times for Theorists in a Post-Higgs World: The Large Hadron Collider’s big success leaves no clear avenue for new physics
- In the Eye of the Tiger: Global spread of Asian tiger mosquito could fuel outbreaks of tropical disease in temperate regions
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Contents
- Infection time: Disease is more severe when it hits in the morning, at least in mice
- Explainer: Our bodies’ internal clocks: Biological clocks determine hunger, sleepiness and other daily rhythms
- Flu in the air: Germs tiny enough to pass through surgical masks may cause half of all cases
Sleep waves
View larger version | People oscillate between two types of sleep each night, REM (short for rapid eye movement) and non-REM. Non-REM sleep occupies about 80 percent of sleep time and consists of ever-deepening stages (shown in EEGs below left). Most sleep time is spent in stage 2, which has two signature brain wave signals. About 20 percent of the night is spent in REM sleep, with REM bouts growing longer as the night progresses.
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Coverage of the 2013 American Association for the Advancement of Science meeting
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The Year in Science 2012
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By Leila Schneps and Coralie Colmez
Review by Janet Raloff
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