When observing their young child, more than once parents notice that " something" in the child's appearance makes them uneasy. Seemingly everything is fine, the child is smiling, playing - but somewhere in the back of the parent's mind there is a flash of light - it seems that something is wrong. It turns out that sunset syndrome, which can be recognised by the peculiar appearance of the eyes, can suggest, for example, hydrocephalus - in which case, medical consultation is essential.