Sleep Science Briefs:
Sleep Research Updates & Clinical Insights
Navigating the Noise in Sleep Science
There is a lot of conflicting advice out there about sleep. One day a headline says a new supplement is a miracle cure; the next day, it's a health risk.
To help you navigate this, The Better Sleep Clinic team reviews the latest sleep research and news, translating complex data into actionable clinical insights. To save you time and anxiety, every update is graded using a simple Traffic Light system:
🟢 GREEN (Action: SAFE/GO): Validated science or safe, evidence-based habits.
🟡 YELLOW (Action: CAUTION/NUANCE): Nuanced findings. The study is interesting, but there are risks, limitations, or "catches" you should be aware of before acting.
🔴 RED (Action: STOP/MYTH): Debunking myths, harmful viral trends, or misleading clickbait.
🔵 BLUE (INSIGHT/FYI): Interesting sleep science with no immediate action required.
🟡 CAUTION/NUANCE: Treating your sleep apnea but still can't sleep? Your heart is still at risk.
26/02/26
New research on nearly 1 million veterans shows something critical: having both insomnia AND sleep apnea creates a far worse cardiovascular threat than either condition alone.
This combination - called COMISA - isn't just two problems sitting side by side. They interact, amplify each other, and significantly increase your risk of hypertension and heart disease.
Here's what matters:
-"Treating one while ignoring the other is a bit like bailing water out of a boat without fixing the leak," says lead researcher Dr Allison Gaffey.
- Your CPAP treats the apnea. But if you're still lying awake for hours, your cardiovascular system never gets the recovery it needs overnight.
The bottom line:
- Both conditions need attention.
- Sleep apnea needs medical treatment.
- Insomnia responds best to CBT-I - the gold standard behavioural therapy that addresses the root cause.
If you're managing one but still struggling with the other, it's time to address both.
Read the full study https://read.thebettersleepclinic.com/comisasm
🟡 CAUTION/NUANCE: Menopause changes your brain - and your sleep pays the price.
24/02/26
New research on 125,000 women reveals post-menopausal women face more insomnia, fatigue, anxiety, and depression - alongside measurable brain changes.
Here's what surprised many (but not the behavioural sleep medicine community):
- HRT didn't prevent these brain, sleep or mental health shifts.
- Women on HRT actually reported the highest fatigue levels, despite sleeping the same hours as those not on HRT.
- HRT did slow reaction time decline slightly, but it's not the answer for sleep or mood struggles.
- For further research: The brain regions affected are the same ones involved in Alzheimer's - which may explain why women face nearly double the dementia risk.
THE BOTTOM LINE:
If menopause is disrupting your sleep or mood, lifestyle support and evidence-based behavioural treatment (like CBT-I) matter more than hormones alone.
Read the full study https://read.thebettersleepclinic.com/menosm
🟡 CAUTION/NUANCE: Keep your bedroom below 24°C if you're over 65
19/02/26
New research suggests this simple temperature setting can lower stress on the heart for older adults during sleep.
Here's why it matters:
When your bedroom is too warm overnight, your heart works harder to cool you down - increasing heart rate and limiting recovery from the day's heat.
For older adults, this sustained effort creates stress when your body should be resting.
Australian researchers tracked real-world sleep data using fitness trackers and bedroom sensors throughout summer.
The finding?
Above 24°C (75°F) increased cardiovascular strain during sleep in people aged 65+.
With climate change bringing more hot nights, this isn't just about comfort - it's about protecting your heart's recovery time.
The bottom line:
If you're over 65, aim for 24°C or below in your bedroom overnight, especially during warmer months.
🔵 FYI/INSIGHT: Turns out "night owl" isn't one thing.
17/02/26
New research just split sleep types into five distinct biological subtypes - and they don't all carry the same risks.
A McGill University study of 27,000+ adults found three types of night owls and two types of early birds - each with different health and behaviour patterns.
- One night owl group had sharp cognition but struggled with emotional regulation.
- Another faced higher cardiovascular risks.
- One early bird group thrived, whilst another showed links to depression.
This explains why blanket advice ("just go to bed earlier!") doesn't work for everyone. Your chronotype (aka body clock type) isn't just about bedtime - it's shaped by genetics, environment, and lifestyle.
The bottom line:
Sleep isn't one-size-fits-all, and neither is treatment (and yes, we treat circadian rhythm disorders).
Read the full study https://read.thebettersleepclinic.com/chron5fb
🔵 INSIGHT/FYI: Ever wondered why you sleep poorly in hotels?
Scientists have found the brain circuit responsible for the "first night effect" - that restless night in unfamiliar places.
Researchers identified specific neurons in the extended amygdala (brain area associated with emotions) that release neurotensin (boosts vigilance) when you're in a new environment, keeping your brain on alert.
- It's an evolutionary survival mechanism - your brain staying vigilant against potential threats.
- The study (in mice) showed this circuit involves areas present in all mammals, suggesting humans share this response.
- While the findings might one day lead to new treatments for insomnia or PTSD-related sleep issues, we're years away from clinical application.
The Bottom Line:
Your brain is doing its job when you sleep poorly somewhere new - it's biology, not a sleep problem/disorder.