Easy Wake Up Musical Alarm Clock
This is a Widows-only application. Description: "You program the clock with the (latest) time you want to wake up. About an hour before wake up time, the clock starts playing music softly at a very low volume. Music volume increases very slowly during the next hour. This ensures that you are not wakened suddenly from a deep sleep. It gives your brain time to reach a lighter phase of sleep before waking up."
Is there a Mac one for this?
Alarm Clock 2 by Robbie Hanson (Mac only) has a time limit of 14 minutes for "easy wake", and that is still too abrupt.
But even if there was, I wouldn't want to have my computer on all night (waste of energy).
There is an iPhone app that senses your movements and wakes you up when you are in light sleep:
How to attach iPhone | EasyWakeup - Le réveil-matin intelligent pour iPhone
...but you have to attach it to your body for it to work.
If someone (Steve?) could create iPhone app that plays a music from silence to quite loud over a period of 1 hour or so, tons of time could be saved.