The Ringtail Unicornfish, which occurs in tropical marine waters of the Indo-Pacific. All fish sleep, even the weird-looking ones.
Fish may not have eyelids to close, but they sleep – and perhaps even dream.
Research on lucid dreams is still in its infancy, but some induction techniques already hold real promise - and most can be tried in the comfort of your own bedroom.
Scientists have a few ideas about where dreams come from – but nobody knows for sure.
When we are asleep our brain does not switch off. It keeps working, but not as hard.
The remains of an Ixil man emerge from the ground, one of the countless victims of the civil war in Guatemala.
Tristan Brand/FAFG Fundacion de Antropologia Forense de Guatemala
The Ixil people of Guatemala dream of the places where their dead, massacred during the country's armed conflict might be located.
Sleep paralysis and exploding head syndrome can help explain things that go bump in the night.
Does our body “switch off” when we sleep?
Mami Kempe / The Conversation
The most interesting part of our body that changes during sleep is our brain.
Dreams are like a forest walkway: there’s no clear sense of direction and you can easily get lost.
Niamh, age 7, wants to know why we have scary dreams. But after 200 years of study, dreams are still very much a mystery.
It’s a myth that waking up a sleepwalker is dangerous.
People have long been fascinated with sleepwalkers. Is it dangerous?
Synesthetic number form from the book Wednesday is Indigo Blue: Discovering the Brain of Synesthesia.
Richard E. Cytowic
Researchers are trying to train synaesthesia-like associations in people who don't have the condition.
It’s common for elderly bereaved people to hear their deceased partner speak to them.
... and more meaningful.
Take me to the stars.
Lucid dreaming is showing some promise in treating nightmares. Could it help treat some mental illnesses, too?
Dreams may be our innermost, suppressed wishes.
It seems we do dream of the things we try to suppress.
Catching those Z’s.
Sleep is often overlooked as a treatment for brain injury, but new research could be about to change that.
About half of us will experience at least one lucid dream in our lives, where we are aware and may be able to take control of it. What can this tell us about consciousness?
He’ll be manipulating your brain before too long.
It's been 60 years since first TV ad aired in the UK. What could the next 60 bring?
Dreams and their purpose have been one of the enduring mysteries of sleep.
diastème (Sarah Giboni)/Flickr
Brain activity during the dreaming phase of sleep is remarkably similar to brain activity when we're awake and processing new visual images, new research shows.
Sleep by Shutterstock
When you sleep your brain consolidates memory and encodes experiences. A recent study sought to show how this was happening.
Each dream has its own brain scan ‘signature’.
You may have read last week that a team of researchers has developed, for the first time, a way to detect the contents of people’s dreams. But what can we glean from this research? During the same week…
Something’s going on behind your eyes … but what is it, and why does it happen?
For most of human history, dreaming has been seen as a second “reality” in which altered forms of perception provide insights into ourselves and others, our fears, fantasies and motivations or even the…