WiFi uses radio (2,500,000,000 Hz), which is on the same spectrum as light. Solar ultraviolet light has more power, and a much higher frequency (10,000,000,000,000,000 Hz) and can give you a sunburn after 15 minutes of direct exposure. So, you'd have to lay on your WiFi-router for more than 1,500,000 minutes (virtually 3 years) to acquire a WiFi-burn.
WiFi has an output of 0.1 to 0.5 watts. Microwave ovens operate at about the same frequency, but have an output of 600 to 1500 watts! You'd have to lay on top of a WiFi router for 10000 minutes (1 week) in order to acquire the same effect as cooking yourself in a microwave for 1 minute.
Radio waves have an "inverse square" falloff (you can look that up), meaning a little bit of kinetic-ism away from a radio transmitter causes an immensely colossal difference in lost power... So, if you're doing anything but cuddling up with your router, all of the above numbers will be much, much more diminutive minuscule.
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In short, don't sleep on your WiFi. It could hurt you. Otherwise, you're pretty safe.
I'm conjecturing like most people you probably have at least one cordless phone (and/or cellphone) as well as other things on the list below...Other 2.4GHz radiation:
-microwave cooking ovens (if they leak, dangerously high radiation)
-many cordless phones (about the same or slightley more power than wifi)
-some baby-monitors
-wireless survalence cameras
-wireless audio/video senders
-bluetooth
Other non-2.4GHz radiation:
-cellular phones (these have to send a couple miles to the tower)
-other cordless phones
-hobby cameras
-TV & Radio broadcasts
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