Breaking News
May 26, 2018 - Lifetime risks of developing Alzheimer’s dementia vary by age, gender
May 26, 2018 - Researchers find novel ways to improve participation in clinical research
May 26, 2018 - Researchers develop methods for measuring free-base nicotine levels in e-cigarettes
May 26, 2018 - AHA: Preterm Birth Could Warn of Mom’s Future Heart Risks
May 26, 2018 - Some calories more harmful than others
May 26, 2018 - Study links cell size with commitment to division
May 26, 2018 - Researchers develop new, rapid blood test to detect liver damage
May 26, 2018 - Researchers discover cascade of immune processes linked to poor outcomes in aggressive breast cancer
May 26, 2018 - New research will use mathematics to solve mysteries in cell biology
May 26, 2018 - Mice remain slim on burger diet
May 26, 2018 - BMC receives $13.5 million award to test methods for delivering childhood anxiety treatment
May 26, 2018 - ‘Right to Try Act’ will not benefit terminally-ill patients
May 26, 2018 - Study reveals novel statistical algorithm to identify potential disease genes
May 26, 2018 - Two genes play vital roles in malignant brain cancer
May 26, 2018 - Study explores link between groundwater lithium and diagnoses of bipolar disorder, dementia
May 26, 2018 - Researchers reveal stimulatory effects of myelin on young neural cells
May 26, 2018 - Small part of cellular protein that helps form long-term memories also drives neurodegeneration
May 26, 2018 - Four-legged friends can have heart issues, too
May 26, 2018 - Scientists create small, self-contained spaces inside mammalian cells
May 26, 2018 - Better Social Support Network Protects Black Men Against HIV
May 26, 2018 - National Heart, Lung, and Blood Institute (NHLBI)
May 26, 2018 - Burnout, depression can affect ophthalmology residents, study finds
May 26, 2018 - Latinos and African Americans more likely to experience serious depression than Whites
May 26, 2018 - Data from past epidemic could help improve response to future Ebola outbreaks
May 26, 2018 - Researchers provide insight into how the memory molecule limits brain plasticity
May 26, 2018 - OSU biologist describes ‘restoration ecology’ approach toward patient health
May 26, 2018 - New approach to study brown fat could aid in finding treatments for obesity
May 26, 2018 - Could More Fish in the Diet Boost Sex Lives and Fertility?
May 26, 2018 - NTU Singapore and SERI invent new scope to diagnose glaucoma
May 26, 2018 - Cancer cells co-opt pain-sensing ‘neural channel’ to increase tolerance against oxidative stress
May 26, 2018 - Study uncovers why pesticide exposure increases Parkinson’s disease risk in some people
May 26, 2018 - Study finds link between lead exposure and fertility rates
May 26, 2018 - Delivery of standardized diabetes care could help achieve equitable health outcomes for all patients
May 26, 2018 - FDA authorizes marketing of OsteoDetect software for detecting wrist fractures
May 26, 2018 - Children and adolescents growing up in extreme societal conditions more likely to resort to violence
May 26, 2018 - New study puts forth most comprehensive tree of life for malaria parasites
May 26, 2018 - UVA researchers establish new guidelines for explorers of the submicroscopic world inside us
May 26, 2018 - Princeton Instruments and C-SOPS announce collaboration on innovative pharmaceutical technology
May 26, 2018 - New research shows why babies need to move in the womb
May 26, 2018 - UK steps forward to tackle global antimicrobial resistance
May 26, 2018 - CRISPR-Cas9-based strategy allows researchers to precisely alter hundreds of different genes
May 26, 2018 - Novoheart announces next generation of ‘Human heart-in-a-jar’ technology for advanced drug discovery
May 26, 2018 - UT Southwestern-led researchers find new way to determine prognosis of invasive kidney cancer
May 26, 2018 - Researchers develop film to prevent bacteria from growing on dental retainers and aligners
May 26, 2018 - Mobile health intervention for people with serious mental illness as effective as clinic-based treatment
May 26, 2018 - Vaginal estradiol tablets outperform moisturizers when treating vulvovaginal problems
May 26, 2018 - Researchers call for new genetic tests for congenital diseases
May 26, 2018 - KHN’s ‘What the Health?’ Campaign promises kept, plus ‘nerd reports’
May 26, 2018 - AARDA collaborates with Allegheny Health Network and new AHN Autoimmunity Institute
May 26, 2018 - Lung-on-a-chip technology could streamline drug-testing for pulmonary fibrosis
May 26, 2018 - Researchers work together to solve mystery of motor neuron death in ALS patients
May 26, 2018 - Study finds early antibiotic initiation for majority of premature infants
May 26, 2018 - New environmental monitoring project finds increased numbers of deer ticks in Southern Indiana
May 26, 2018 - Pediatricians Should Advocate for Life Support Training
May 26, 2018 - Cannabidiol significantly reduces seizures in patients with severe form of epilepsy
May 26, 2018 - Allergies can have serious, far-reaching consequences on adolescents
May 26, 2018 - Scientists develop lab-based system to study mechanisms of common liver disease
May 25, 2018 - New guidelines may help pathologists to more accurately classify and diagnose invasive melanoma
May 25, 2018 - Immune cells promote lung cancer metastases by forming clots in tumors, study finds
May 25, 2018 - Can Excess Weight in Toddlers Cause Brain Drain?
May 25, 2018 - Studying insight
May 25, 2018 - Researchers reveal potent new mechanism of action for treatment of IBD
May 25, 2018 - Study shows lack of follow-up care for patients with concussion
May 25, 2018 - Study establishes the importance of haploid cells
May 25, 2018 - Coveted BMJ award bestowed on The Clatterbridge Cancer Center
May 25, 2018 - AACN outlines evidence-based protocols and clinical strategies to manage alarms
May 25, 2018 - Origami inspires researchers to develop new solution for tissue regeneration
May 25, 2018 - Melorheostosis – Genetics Home Reference
May 25, 2018 - Non-addictive pain medication changing therapy for substance use disorders
May 25, 2018 - Delayed lactate measurements in sepsis patients increase risk of in-hospital death
May 25, 2018 - Researchers identify novel epigenetic mutations as cause of neurodevelopmental, congenital disorders
May 25, 2018 - UD researchers examine connection between DNA replication in HPV and cancer
May 25, 2018 - Researchers identify neurons that play key role in aggressive behavior
May 25, 2018 - Snail’s eye inspires new type of RIOCATH urinary catheter
May 25, 2018 - Russian researchers develop high-tech device-transformer for ultrasound examination
May 25, 2018 - Researchers discover unexpected chemosensor pathway for predator odor-evoked innate fear behaviors
May 25, 2018 - Researchers build 3-D printer that offers sweet solution to making detailed structures
May 25, 2018 - Nearly one in three people know someone addicted to opioids
May 25, 2018 - Research suggests link between faulty gene, alcohol, and heart failure
May 25, 2018 - New findings could help fine-tune treatment for cancer patients
New study affirms bedtime habits of Americans

New study affirms bedtime habits of Americans

image_pdfDownload PDFimage_print

A new analysis by Johns Hopkins researchers of national data gathered from physical activity monitors concludes that most Americans hit the sack later on Friday, Saturday and Sunday nights. Delayed bedtimes are especially pronounced for teens and young adults.

A report of the findings, published in the April issue of Chronobiology International, adds evidence to support recent pushes for later school start times, say researchers from the Johns Hopkins Wearable and Implantable Technology group.

“While most other studies have measured the timing and duration of bedtime through self-reports, we believe this is the first large-scale study to look at all days of the week separately and to use physical activity monitors to objectively determine gender-specific bedtime preferences and their changes over life span,” says Jacek Urbanek, Ph.D., assistant professor of medicine at the Johns Hopkins University School of Medicine and the study’s first author.

Chronic sleep deprivation, often compensated with oversleeping on weekend nights, has been linked in previous research to depression, smoking, and alcohol and drug abuse, as well as being significantly overweight and less physically active in adolescents. In adults, sleep deprivation and sleep irregularities have been linked to cardiovascular diseases, stroke, cancer, diabetes and premature mortality.

For the study, Urbanek and colleagues used data from the 2003-2006 National Health and Nutrition Examination Survey, a collection of wide-ranging health information from the United States population, to examine bedtime preferences for 11,951 participants ranging from 6 to 84 years old.

Each participant wore an accelerometer, a research-grade device similar to commercial fitness monitors, which measured physical activity for seven consecutive days. All participants received in-person instructions to take the devices off before going to bed and put them back on upon waking up.

For the analysis, the researchers considered the bedtime nonwear periods as objective bedtime (OBT) and used the OBT’s midpoint (OBT-M) as a measure of chronotype, or a person’s preference for timing of sleep.

“If you would like to compare the preference for timing of sleep of two people who get exactly the same, say, eight hours of sleep, but one goes to bed at midnight and wakes up at 8 a.m., and the other one goes to bed at 2 a.m. and wakes up at 10 a.m., you can use sleep midpoints that are 4 a.m. and 6 a.m., respectively. The midpoint on work- or school-free days is supposed to capture personal preferences for timing of sleep, which is controlled by circadian clock and which is different from total sleep duration controlled by homeostasis,” explains Vadim Zipunnikov, Ph.D., assistant professor of biostatistics at the Johns Hopkins Bloomberg School of Public Health and the paper’s senior author.

By measuring such midpoints, the research team found that for all age groups, people on average went to bed later on Friday, even later on Saturday, and a bit less later on Sunday nights compared with weekday nights. The disparities were largest in teenagers and young adults, peaking at about 19 years old with on average 60-, 75- and 30-minute later bedtime midpoints on Friday, Saturday and Sunday nights, respectively.

“Despite the need to get up for work or school the next morning, Sunday midpoints are still significantly later, arguably because of oversleeping on Friday and Saturday nights. This means that a lot of people likely start their week on Monday morning with some sleep debt,” says Zipunnikov, affirming previous research.

Additionally, midpoints of weekdays for teenagers were on average around 3:50 a.m., more than an hour later compared with average midpoints of 2:45 a.m. for adults. This likely indicates that many middle and high schoolers do not get the minimally recommended eight hours of sleep.

“Our findings provide additional evidence that sleep-wake cycles of teenagers are delayed and support for the idea that social systems should not encourage further sleep deprivation but instead work around physiological needs,” says Urbanek.

One way to accommodate these needs, the researchers say, is to delay school start times for middle and high school students. Organizations such as the American Academy of Pediatrics, the American Academy of Sleep Medicine and the American Sleep Association have all released policy statements recommending later school start times. The American Academy of Pediatrics recommends that middle and high schools start no earlier than 8:30 a.m.​

Source:

https://www.hopkinsmedicine.org/news/media/releases/americans_bedtime_habits_affirmed_in_new_study

Tagged with:

About author

Related Articles