Someone more familiar with this than i am will reply (i'm sure).
They go in sleep mode and are triggered only at the specified time interval
I suspect that having a process "sleep" does
tie up some resources. The scheduler is already running all of the time, so there would be nearly no additional "cost" to schedule this.See next post - Looks like tying up resources does NOT happen - Thanks Robert!
I also suspect that nearly everything that runs regularly is controlled by the schedule. IMHO, it is better to manage all of this in one place.