Martin built this Sunshine Alarm Clock in short time out of need. It is for his child but I think a brighter version of this slowly waking me up in the morning would be a nice change to the loud buzz from the alarm clock. All of the code and build details are here so you can make one for yourself.
“After I left our childs alarm clock at the grandparents one weekend I had to scrape together the parts to recreate the clock before he would go to sleep that evening. Thankfully I had a Neopixel ring and an RTC chip nearby so with an Arduino to patch it all together I managed to improvise a child’s sunshine alarm clock.”