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Polysomnography (PSG) is a multi-parameter type of sleep study and a diagnostic tool in sleep medicine.The test result is called a polysomnogram, also abbreviated PSG.The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").
Troublesome. 10–15. Manageable. 15–20. Excellent. The Multiple Sleep Latency Test ( MSLT) is a sleep disorder diagnostic tool. It is used to measure the time elapsed from the start of a daytime nap period to the first signs of sleep, called sleep latency. The test is based on the idea that the sleepier people are, the faster they will fall ...
Non-24-hour sleep–wake disorder causes a person's sleep–wake cycle to move around the clock every day, to a degree dependent on the length of the cycle. This is known as free-running sleep. [citation needed] People with the disorder may have an especially hard time adjusting to changes in "regular" sleep–wake cycles, such as vacations ...
The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1]
No, four hours of sleep is not enough for the average person. The minimum amount of sleep recommended for adults by the American Academy of Sleep Medicine is seven hours. These recommendations are ...
Microsleep. A microsleep is a sudden temporary episode of sleep or drowsiness which may last for a few seconds where an individual fails to respond to some arbitrary sensory input and becomes unconscious. [1] [2] Episodes of microsleep occur when an individual loses and regains awareness after a brief lapse in consciousness, often without ...
Ferber method. The Ferber method, or Ferberization, is a technique invented by Richard Ferber to solve infant sleep problems. It involves "sleep-training" children to self-soothe by allowing the child to cry for a predetermined amount of time at intervals before receiving external comfort.
Assassination attempts and plots on the President of the United States have been numerous, ranging from the early 19th to the early 21st centuries. On January 30, 1835, Andrew Jackson was the first president to experience an assassination attempt when Richard Lawrence twice tried to shoot him in the East Portico of the Capitol after Jackson left a funeral held in the House of Representatives ...