Niamh, age 7, wants to know why we have scary dreams. But after 200 years of study, dreams are still very much a mystery.
The theme of this year's NAIDOC week is "Our Languages Matter". Aboriginal languages under threat across Australia. Read a Warlpiri introduction to Dreamtime and The Dreaming.
Sleep is often overlooked as a treatment for brain injury, but new research could be about to change that.