Watch Expedition 55/56 Flight Engineer Ricky Arnold discuss the crew sleeping quarters, why sleep is important and how they adapt for circadian rhythms aboard the space station.

We have some questions about sleep: It’s ok to stay up late, right? Is it possible to control your dreams? Do all animals sleep? Why do we need to sleep anyway?

Everyone has dreams, but some people are better at remembering them than others.

The tremendous complexity of the human brain makes it difficult for psychologists to pin down exactly how and why things go wrong, so how do we define and diagnose disorders?

Our body is supposed to be paralyzed during REM sleep, but REM sleep behavior disorder might not allow you to stay in bed.

People with ADHD often have problems getting to sleep, but is it the ADHD symptoms that causes the lack of sleep or lack of sleep that cause ADHD symptoms?

For most people, insomnia won’t kill you. But in one very rare, very specific case, not only is it deadly, it’s lurking in your genes.

Not sleeping enough turning you into a monster?

Getting enough sleep is really important for the development of your brain, muscles, and emotional health.

Katherine Hatcher, who studies hormones, sleep cycles and circadian rhythms, helps Alie dissect her terrible sleep habits and talks about a magic tiny area in our brains that acts as your body’s Big Ben.

Called “The Sleep Whisperer,” neurologist and sleep specialist Dr. W. Chris Winter joins Alie for a thrilling 2-parter about why we need sleep, the ideal amount of it, what sleep does to the brain, insomnia, sleep stages, ideal bedtime conditions, and even the historical lore around sleep paralysis.

Hassan speaks to Short Wave’s Emily Kwong about de-stigmatizing sleeping in late, and why a good night’s rest is so important for your immune system.