Cosmology of sleep
When the Soul Left the Body Each Night
Egyptians believed that dreams were a gateway to Duat, the underworld and world of the gods. Sleep was a "little death" in which the soul (Ba) left the body and traveled between worlds. Every night was a journey; every morning, a small resurrection.
The hieroglyph for "dream" (rswt) depicts an open eye, a deep paradox: in sleep, a different kind of vision opens. The Egyptians understood what neuroscience confirmed millennia later, that the dreaming brain is extraordinarily active, not passive.
This was not folk belief but state religion. Dreams were considered divine communiqués, and pharaohs employed professional dream interpreters, priests known as "Masters of Secret Things" (wab seshta), whose interpretations could shape military campaigns, temple construction, and succession.
"The hieroglyph for 'dream' shows an open eye, in sleep, a different kind of vision begins."
On the Egyptian understanding of dreaming