For example, take a look at this sentence below:
I wake up at 7am every morning, but I don't get up until 7:15.
If we consider them to have the same meaning, this sentence wouldn't make sense!
"Get up' means you physically get out of bed. The past tense of 'get up' is 'got up
The phrasal verb 'get up' isn't just used when we talk about sleeping, but we can use it any time we're talking about a movement that requires someone to move from a position of down to up. For example, "Get up! It's dirty on the floor!"
We can also change the 'up' to 'down' when we're talking about moving from a up position to down. For example, "Get down from the roof, you'll break your bones if you fall!"
What time do you usually wake up and what time do you usually get up?