Wake up earlier, naturally

I wasn’t sure if I would like the Philips Wake-Up Light Alarm Clock, but in one month it’s trained me to wake up earlier, naturally. I set the alarm for the time I want to wake up and the light gradually increases beginning about 20 minutes before the alarm is set to go off. During that time is when I usually wake up. When the wake-up light doesn’t work, I get woken up by the sounds of birds chirping. Either way, I’m never startled or grumpy. — CD