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Tag: "nighttime" at biology news

Prenatal Stress Keeps Infants, Toddlers up at Night, Study Says

...w long the child slept (a consolidated daytime and nighttime total), how often the child awoke, and if he or she exhibited any of seven common forms of sleep problems, such as having nightmares, refusing to go to bed or having trouble falling asleep. Surprisingly, babies born to mothers classified as anxiou...

Sleep quantity affects morning testosterone levels in older men

...-to-nine days were used to determine the amount of nighttime sleep of the participants in everyday life setting...rone levels. Analyses revealed that the amount of nighttime sleep measured by polysomnography was an independent predictor of the subjects?morning total and fre...

Tracking sperm whales and jumbo squid

...tudy also revealed that the squid often made rapid nighttime dives from the surface to deeper waters preferred ...y are recovering at depth immediately after a deep nighttime dive," he explained. In previous studies, Gilly found that jumbo squid are well adapted to the lo...

Negative effects of caffeine are stronger on daytime sleep than on nocturnal sleep

...se coffee and other sources of caffeine during the nighttime to counteract sleepiness generated by sleep deprivation, jet lag, and shift-work. However, this habit may have important effects when you then try to recuperate during daytime." Thirty-four moderate caffeine consumers participated in both caffeine ...

New Research Shows Artificial Light at Night Stimulates Breast Cancer Growth in Laboratory Mice

...ults from a new study in laboratory mice show that nighttime exposure to artificial light stimulated the growth...in. The study also showed that extended periods of nighttime darkness greatly slowed the growth of these tumors. The study results might explain why female nigh...

Bats use touch receptors on wings to fly, catch prey, study finds

...tten theory that bats use their sense of touch for nighttime navigation and hunting. The theory that bats fly by feel was first proposed in the 1780s by French biologist Georges Cuvier, but faded in the 1930s when researchers discovered echolocation, a kind of biological sonar found in bats, dolphins and a fe...

NRL scientists detect 'milky sea' phenomena

...der both solar and lunar illumination. To achieve nighttime detection, the OLS uses a sensor capable of registering extremely low levels of visible light. This system has been used to detect terrestrial and atmospheric emission sources such as fires, lightning, and human activity (city lights, fishing boats, ...

Sudden change in social status triggers genetic response in male fish, study finds

...nant animals." Nighttime behavior To observe nighttime behavior of the cichlids, Burmeister donned infrared night-vision goggles and kept close watch on the experimental fish tanks. She soon discovered that dominant males undergo a temporary change in the dark--their bright color turns pale, and their ey...

Biologist Discovers What May Be World’s ‘Pickiest?Mates

...rvae to hatch at the safest time, the peak outward nighttime flow of the biweekly tidal cycle.?/p> “Wide burrows speed incubation, so cause the larvae to hatch too early and miss the peak tides. This research provides one of the first examples of how choosy resource selection can help offspring survivorshi...

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