-
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?