Generally, it's an alarm that wakes you up and reminds you that it's time to get up, well it's fair enough as you are in a deep sleep and something or someone needs to be there to remind you ok, it's a time to get up.
How about a situation in your life when you are completely devasted by all means and you need to rise up and get to a stage you were before, you might know how to get up but the most important thing at this point would be your mental state which needs boost up and tell you, ok, we are ready to get up.
It generally doesn't happen so easily as the situation has destroyed you to the extent that to perform the smallest task you require lots of strength because your confidence is totally shattered now and it cannot be built overnight it requires small and continuous effort to be there.
When slowly and steadily you make progress and at one point you are confident enough that you can achieve what you want, that's when you call it Time to Get Up.