Thanks for the feedback.
And if you leave the alarm clock plugged in, the screen always lights up, but only brightly.
Can this be changed to dimmed? Thank you very much.

To my knowledge and experience, this does not work. You can only set the brightness and if you want to know the time at night - you tap lightly on the surface and the time lights up for a few seconds. This probably also saves energy and allows a fairly long operating time until the next recharging procedure - so very rare.