I use to dread wake up in the morning the terrifying noise of my cellphone , now I have a 30 minute buffer . when I wake up to the light I can get right up , or lie in bed until the audio alarm sound . the nap and sunset function be also very useful . to be sure , this thing be not perfectly design -lrb- I put low tack duct tape over the green led display and the radio be cheap -rrb- but it be pro far outweigh any of this . personally , this be more than enough light to wake I up -lrb- usually within 10 minute of a 30 min cycle -rrb- ... but maybe you be one of those people that can sleep through anything .