random alarm clock?

hi:) Does anyone know of any software that lets me have an alarm clock go off randomly up to eight times within a set period? For example, I could configure it to trigger five times at random intervals during a 16-hour window.

Not necessarily a physical "working" clock... Perhaps a PC program or a phone app....

sorry that's what I meant lol a software program if anyone knows of a pc-based clock like that and not a physical one:D