In 99% of times you should not be using Sleep as it is an arbitrary wait. Your Blue Prism training will have taught you to always use intellegient waits (where you wait for an element or you wait for something to happen) wherever possible as they are more robost and more efficient.
The Sleep action was created because there is no wait stages in Process studio and should only be used for building polling lkogic in your process (examples of this are in the advanced proces templates, but effectivelly look for new work, none found, sleep, look for new work again etc...).
If your senior developer or mentor ever sees sleeps being used in object studio or instead of intelligent waiting logic he should shout loudly!!