Alarm clock caused by light

Speaking of alarm clock, it sounds banging with a sharp sound at set time, but it forces you to wake up, but this is caused by light.

Details are as follows.Gizmag Article: The Wake-up Light

It is said that Phillips of the Netherlands is an alarm clock developed by applying the awakening of the human body by the sunlight. He said that he will start selling earlier this month in France.

How to wake it up is that the lamp attached to the top of the clock glows 30 minutes before the set time, the light gradually increases from there, and at the set time just enough to make the human body awake It is said that it will happen with a light intensity. It seems that natural waking up can be expected instead of being launched by a sharp sound.

If you open the curtain of the window before going to bed, it will be possible to expect the same effect, but then it can not happen at a specified time other than morning, and rainy days and cloudy days also happen As it is impossible to say that it is worth existing in this wake-up. It may be helpful if there is also a function that sounds loud because of the time when it could not get up with light.