I do have this habit of leaving my WiFi switched on in nights and mostly for 24/7. I will use my day time Internet to work on daily tasks and nights will be for torrent downloads of latest Hollywood movies or Sitcoms. This is the story of many of my friends and readers too.
The very useful technology of WiFi poses some harmful effects on us if we don't take proper precautions. The WiFi router emits dangerous and harmful electromagnetic waves or WLAN signals that are extremely harmful to our health.
The British Health Agency has studied and come up with some proven facts on the above topic.
Being close to such radiations late night or even technology for that matter can lead to certain activities in your brain. This does not let you sleep.
The lack of a good night's sleep will eventually lead to a tired feeling the other day.
These radiations also prove to slow your brain's function and kill your ability to concentrate on one thing.
This seems to be a very indirect cause. But, this is proven and hence should be taken seriously too.
These all symptoms will make your brain so tired that you have high chances of a headache.
Just turn off WiFi in the night and when not in use. Never keep your router in kitchen or bedroom and make sure to replace home wireless phones with cabled ones.