Looking on the internet deeply has found these results:

Woke up in 6 is the most popular phrase on the web.

Woke up at 6 1364,000 results on the web	Woke up in 6 11,770,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
You know, when mom was alive, you woke me up at 6:00 A.M. to open presents. I woke up around 6:00, and Brian was pounding on my door. Once, I woke up at a convenience store. The new Bay Kennish woke up at 6:45 A.M., made you a pot of freshly brewed coffee, ran out and picked up some salted caramel sticky buns... ...From La Crèmerie. We woke up at 8.30 to face about 40 policemen. I woke up at 6:00 when he slammed the car door and sped off. He woke up at three this morning and changed and brushed his teeth.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Woke up at 6

1364,000 results on the web

Woke up in 6

11,770,000 results on the web

More popular!

You know, when mom was alive, you woke me up at 6:00 A.M. to open presents.
I woke up around 6:00, and Brian was pounding on my door.
Once, I woke up at a convenience store.
The new Bay Kennish woke up at 6:45 A.M., made you a pot of freshly
brewed coffee, ran out and picked up some salted caramel sticky buns... ...From La Crèmerie.
We woke up at 8.30 to face about 40 policemen.
I woke up at 6:00 when he slammed the car door and sped off.
He woke up at three this morning and changed and brushed his teeth.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.