Free Alarm Clock allows you to set as many alarms as you want. You can set one-time alarms or repeating alarms - activate only from Monday through Friday and give you a chance to sleep on the weekends. Alarms that you set will sound even if computer goes to sleep.
Besides, the alarm clock can remind you about important events by playing your favorite music and showing a notification message. You can set alarm volume level to a comfortable level depending on the time of the day. Free Alarm Clock will let you do it. Sleep, suspend, hibernation and standby means the same thing. This feature is PC dependent and only possible for PCs that can go to sleep mode.