Mixed
Adolescent sleep deprivation (less than 8.5 hours of weeknight sleep) and excessive daytime sleepiness are significantly associated with decreased academic performance (lower grades, tardiness) and reduced extracurricular activity participation.
If you are an adolescent or a parent of one, recognize that feeling sleepy in the morning is often biological, not just behavioral. Teens need roughly 8.5 hours of sleep. If school starts early, this is biologically difficult due to a natural shift in body clock (sleep phase delay). Prioritize sleep duration and consider later school start times as a structural solution to improve grades and mood, rather than just blaming the teen for 'poor sleep hygiene'.
Seventy per cent of the students had less than 8.5 hours weeknight sleep... As ESS increased there was an increase in the proportion of students who felt their grades had dropped because of sleepiness, were late for school, were often extremely sleepy at school, and were involved in fewer extracurricular activities.
Why this rating
Large sample size (n=3235), consistent results across two distinct surveys, and statistically significant associations, though limited by self-reported data.
Source
"Sleepiness" is serious in adolescence: Two surveys of 3235 Canadian students
Edward S. Gibson et al. · BMC Public Health · 2006
DOI 10.1186/1471-2458-6-116
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →