How are the two sentence different with okiru?

Question

kinou wa nerunoga osoku natte shimaimashita.

 

kinou wa okirunoga osoku natte shimaimashita.

 

 

 

Same meaning as 

neboushimashita

 

But both sentence say the person was late to sleep or overslept?

 

Answer 1

I agree with Ms. Kiomi. It's whether go to bed late (the first one) or wake up late (the second one).

Answer 2

The first sentence is saying that you went to bed late last night. The second sentence is saying you woke up late.