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Girlfriend had one for a year or so.
Can't say I noticed much of a difference getting up but then that could have been that she continued to set the thing 30mins before she wanted to get up and then kept hitting snooze.
But it does wake you up, and it's not jarring.So it's alright. Did the job, but not a revelation.
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We have one, light starts to build/increase to whatever level you set it to the night before from 30 min before whatever alarm you set. I mostly find it handy to not have to fumble about to turn on a light when the alarm goes off. Other than that I don't know if it has any other kind of effect.
Also handy if either of us have a very early start and don't want to annoy the other too much. Just set a lower brightness.
Being able to snooze it by giving it a whack is also satisfying.
Are Lumie Bodyclock alarm clocks (or other brand light-up alarm clocks) any good? Does anyone have any experience using one?