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Skin has light receptors that help the body changing states. It helped me a lot to find out this.

Light works for me too. It's also the reason why I often oversleep in hotels with heavy light-proof drapes.

I have "Wake-up Light" made by Philips, which slowly turns light on at the morning to simulate sun raising. It helps me too.

PS. But it badly designed because it power adapter produces some low noise during night, which I can hear by one ear. It display is too bright and it built-in speaker is too cheap. :-(