Why do we sleep at night instead of during the day? In this episode of SciShow Hank talks about circadian rhythms, how they work, and how they regulate different processes in our bodies.

We’re learning more about the differences in health between early risers and night owls, and new research could offer even more evidence that vaping is just different from smoking, not necessarily better.

If you’ve ever noticed that being sick often sucks more at night, that wasn’t your imagination. Fevers do often rise at night! Why do our bodies do that? Is there a reason we have to suffer more?

You might think your grandma who wakes up at 4am just needs less sleep than younger people. Not so! Studies suggest there are some bizarre reasons older people rise at the crack of dawn, including something called brain sand!

For most of us, our bodies are interacting with phones nearly all the time, whether we're looking at screens, listening to music, or carrying them in our pockets. If you are wondering about the health implications of a world filled with...

What keeps you up at night? Pondering deep questions? Excitement about a big trip? Stress about unfinished work? What if the very thing keeping you awake was stress about losing sleep? This seemingly unsolvable loop is at the heart of...

One thing we’ve heard from many of you is that this show is your sleep show, that soothing bit of media you put on when you need to slow down your brain and drift off. We take that as a huge compliment. It’s nice to know we can be a...

Are Morning Workouts Better?

Howcast - Learn the top three sleep tips for children and teens from sleep specialist Priyanka Yadav, D.O. in this Howcast video.

Howcast - Learn about common sleep disorders in children and teens from sleep specialist Priyanka Yadav, D.O. in this Howcast video.

Howcast - Learn about the different types of childhood insomnia from sleep specialist Priyanka Yadav, D.O. in this Howcast video.

Understanding sleep stages for better human health with personal health monitoring devices. Observe your deep sleep, light sleep, awake time, and total time asleep.

Unlock the secrets of circadian rhythms and their impact on mental health with Dr. Tracey Marks, a psychiatrist. Discover why bipolar disorder and ADHD are profoundly affected by a disrupted body clock. Learn about clock genes, sleep...

Discover how to improve your sleep quality with four science-backed strategies focusing on regular sleep patterns, light exposure management, optimal sleep environment temperatures, and actions to take if you can't fall asleep. Dive into...

Young sunflowers face the sun when it rises in the east and then track its motion in the sky throughout the day till it sets in the west in the evening. The process repeats the next day, as sunflowers return to their ‘starting’ position,...

The most likely explanation for feeling tired all day but wired at night is that your Circadian rhythm is disrupted. This can be caused by a number of factors, such as adrenal disorders, poor sleep habits, sleep disorders, or mental vs....

Melatonin regulates our sleep cycle and during puberty this hormone becomes imbalanced. Could this be why teenagers are moody? Biology - Being Human - Learning Points. The hormone melatonin regulates the circadian rhythm - the body's...

When children become teenagers, hormonal changes shift their circadian rhythm—they get tired later. Since schools typically don't adapt to their new natural sleep cycle, they often get less sleep during weekdays, affecting their memory...

Uncover the surprising impact of Daylight Saving Time on mental health and body rhythms. Explore how the Sunshine Protection Act could change our mornings and learn practical tips for realigning your circadian rhythm with bright light...

How does light work for sleep? Light has a strong influence over the timing of your circadian rhythm. Light triggers the shut down of melatonin in your brain. So we can use this to our advantage when trying to regulate sleep...

Circadian rhythm sleep disorders can account for many sleep problems. There are many people who have an irregular body clock and they just don’t know it. Circadian rhythm sleep disorders occur when there is a mismatch...

Did you know that many people with ADHD also have sleep problems? Research is showing that the disorder itself changes your circadian rhythm. That’s what this video is about.

As we move from winter to spring into summer, we get longer days and more exposure to sunlight. As such, you may notice your mood ramping up. But it’s not how much light you're exposed to, it’s the rapid change in light...

Explore the journey of lithium, a game-changer in the late 1940s, as it transformed the treatment landscape for bipolar disorder. Join Dr. Tracey Marks, a dedicated psychiatrist, in this deep dive into the historical prominence of...