Search results
Results from the WOW.Com Content Network
The human organism physically restores itself during sleep, occurring mostly during slow-wave sleep during which body temperature, heart rate, and brain oxygen consumption decrease. In both the brain and body, the reduced rate of metabolism enables countervailing restorative processes. [ 97 ]
Since in quiet waking the brain is responsible for 20% of the body's energy use, this reduction has an independently noticeable impact on overall energy consumption.) [11] During slow-wave sleep, humans secrete bursts of growth hormone. All sleep, even during the day, is associated with the secretion of prolactin. [12]
The basic rest–activity cycle (BRAC) is a physiological arousal mechanism in humans proposed by Nathaniel Kleitman, [1] hypothesized to occur during both sleep and wakefulness. Empirically, it is an ultradian rhythm of approximately 90 minutes (80–120 minutes [ 2 ] ) characterized by different levels of excitement and rest.
UCLA researchers reported that sixth-graders who went five days without screen use were significantly better at reading human emotions than sixth-graders with average screen use. [50] In a study done by Muppalla et al. excessive use of screen time in adolescents is linked with triggering dopamine, which is a neurotransmitter that acts as a ...
The researchers discovered that three hours after taking creatine, the participants had positive changes in their brain metabolism and cognitive performance on tests. (They especially did well ...
Some people may even want to be physically closer than usual to loved ones, following them closely “for reassurance,” Elhelou says. For others, sundowning can show up as confusion.
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]
The study’s first finding is that sleeping between 7 and 9 hours each night was optimal for brain function and boosting cognitive ability. Sleeping less than 7 hours and more than 9 hours ...