Allensig, how do you set the 'gentle alarm' to assist with LD's?

There seem to be a lot of alarm apps for android (http://www.appbrain.com/search?q=alarm)
Several of them look very customizable where you can set multiple alarms in one day, even with different sounds,
but it appears they don't have auto shut off features where the alarm just goes off once. I haven't dl'd many of them so I'm not certain of this. I'll keep trying...