Sleep & NighttimeExplainer
Why Do I Wake Up Groggy After a Nap?
Sleep inertia can temporarily slow thinking and reaction time after waking. What a nap study measured, how alarm time differs from sleep time, and when to ask for help.
ArticlesTopic 10
Sleep & Nighttime
Night sweats, snoring, drooling, 3 a.m. bathroom trips and waking up exhausted.
Sleep & NighttimeEvidence check
L-Theanine for Sleep: What Two 2025 Reviews Found About This Tea Supplement
L-theanine, a compound from tea, is sold in sleep gummies and capsules. A 2025 meta-analysis of 18 trials found small improvements in how quickly people felt they fell asleep and in overall sleep quality, but many products mixed it with other ingredients. Here is what the evidence supports and what it doesn't.
Sleep & NighttimeEvidence check
Low-Dose Quetiapine for Sleep: Thin Evidence and Serious Label Warnings
Quetiapine, an antipsychotic, is sometimes prescribed in small doses as a sleep aid. A systematic review found only one tiny trial for insomnia, which didn't show a significant benefit, and concluded these drugs should be avoided as a first choice. The label warns about weight gain, blood sugar and cholesterol changes, dizziness and falls.
Sleep & NighttimeChecklist
Melatonin and Sleepy Herbal Remedies: Check Before Combining
Show your pharmacist the exact products before adding a bedtime herbal remedy.
Sleep & NighttimeEvidence check
Can Morning Caffeine Affect Sleep? A High-Dose Trial
A 400 mg dose affected sleep even 12 hours before bedtime in young men. That is not a personal cutoff for women after 50.
Vivid Dreams While Using a Nicotine Patch? Ask About Overnight Use
Discuss the patch's nighttime instructions as part of your cigarette quit plan.
Sleep & NighttimeEvidence check
Night Leg Cramps After 50: Do Magnesium or Stretching Help?
Magnesium is the most common home remedy for leg cramps at night. A 2020 Cochrane review of trials in older adults found it made almost no difference to how often cramps came, and caused more stomach upset. Stretching has mixed results: one trial of 80 adults over 55 found nightly stretching cut cramps, another of 191 people found it didn't. Here is what to try and when to get checked.
Sleep & NighttimeWhat to expect
Overnight Oximetry Requested? Clarify the Preparation Before Your Test
Check the instructions for the device your sleep service supplies, including its nail-varnish requirements.
Sleep & NighttimeEvidence check
Does Reading on a Tablet Before Bed Hurt Your Sleep?
In a Harvard sleep-lab study, people who read on an iPad for four hours before bed took about 10 minutes longer to fall asleep, made half as much melatonin and felt groggier the next morning than when they read a printed book. A later trial found the iPhone's Night Shift setting didn't improve sleep. Here is what these studies can and can't tell you about your own bedtime screen.
Sleep & NighttimeEvidence check
Six Hours of Sleep or Less in Your 50s and Dementia Risk: What a 25-Year Study Found
A British study that followed nearly 8,000 adults for 25 years found that sleeping six hours or less at age 50 or 60 was linked to a higher chance of dementia later, and persistent short sleep across midlife carried about 30% higher risk. It shows a link, not proof that short sleep causes dementia, but it's one more reason to take midlife insomnia seriously.
Sleep & NighttimeEvidence check
Sleeping in Separate Rooms From Your Partner: What Studies Show
A 2023 US survey found 1 in 5 adults sometimes sleep in another room to cope with a bed partner, and 15% do it every night. A sleep-lab study found couples who shared a bed got more dream sleep. When the snorer's sleep apnea was treated, partners gained about an hour of sleep a night. Here is what the research shows, and why moving rooms shouldn't replace a check for snoring.
Sleep & NighttimeEvidence check
Sleeping With a Light or TV On After 60: What One Study Linked It To
In a study of 552 adults aged 63 to 84 who wore light-measuring wrist monitors, those exposed to light during the darkest part of the night were more likely to have obesity, diabetes and high blood pressure. It can't show the light caused those conditions, but it's a reason to rethink the TV, hall light or bright night-light, while keeping a safe path to the bathroom.
