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What is the latest research on sleep? Aug. 31, 2023 — New animal research suggests that little-studied brain cells known as astrocytes are major players in controlling sleep need and may someday help humans go without sleep for longer without negative. How is sleep research? Sleep tests at a sleep center usually last overnight. Removable sensors will be placed on your scalp, face, eyelids, chest, limbs, and a finger. These sensors record your brain waves, heart rate, breathing effort and rate, oxygen levels, and muscle movements before, during, and after sleep.

  This article is about the region. For the magazine, see   Hudson Valley  (magazine) . Hudson Valley Region Farm in Brunswick Downtown Ossining Hudson River at Bear Mountain The United States Military Academy Getty Square in Yonkers Kykuit mansion Empire State Plaza in Albany Counties most recognized in the region (green); partially recognized counties (gray) [N 1] Country United States State New York Counties Putnam , Rockland , Westchester , Dutchess , Orange , Sullivan , Ulster , Albany , Columbia , Greene , Rensselaer Area • Total 7,228 sq mi (18,720 km2) Population (2013) • Total 2,323,346 • Density 320/sq mi (120/km2) Time zone UTC−5 ( EST ) • Summer ( DST ) UTC−4 ( Eastern Daylight Time ) Part of a series on Regions of New York hide Downstate New York New York City Long Island Hudson Valley (Lower) hide Upstate New York Hudson Valley (Middle and Upper) Capital District North Country Southern Tier Mohawk Valley Central New York Finger Lakes Western Ne...