Any artificial light messes with nature
Ms Gouin explained that if a baby or child sleeps with a night light, it's likely their body is being told to wake, rather than to go to sleep.
"Even when their eyes are closed, the light still comes through, which can mean confusing and mixed messages throughout the entire stretch of night sleep," she added.
"Having a night light or any artificial light on in the sleep space completely messes with nature.
"Our bodies are so cleverly designed to sleep and wake naturally on their own, influenced by dark, night, sleep and day, light, wake - we really shouldn't mess with that and why would we want to?"