Traditionally, the night is for restful, rejuvenating sleep, but in this artificial light, wireless stimulation, Wifi connected society that joins the internet games, phone chats, Facebook etc late at night, is contributing to growing health issues. After witnessing an ever-increasing number of clients suffering from obvious sleep deprivation, depression and poor immune systems, and many from the younger generation, I wonder if it's time to discuss the growing addiction to self-inflicted ill health created by late night technology.

One-third of the population experiences a restless nights' sleep and fail to wake refreshed. The level is even worse for those who place their connected cell phones beside their beds. If you're unsure of the impact that Wifi has on sleep patterns – turn everything off at night, at the wall, for a few days and note the difference in one's mental and physical behaviour. There's plenty of information available about the impact of EMF exposure upon human metabolism. Cellphones in particular need a health warning attached. It could help to reduce the growing depression and suicide rates?

J Priest, Tauranga.