What is the correct grammar for woke up at middle of night?

The phrase "woke up at middle of night" is grammatically incorrect. Here's how to fix it:

Correct options:

* Woke up in the middle of the night. (This is the most natural and common way to say it.)

* Woke up at midnight. (If you woke up specifically at 12:00 AM)

* Woke up in the middle of the night. (This emphasizes the time period rather than a specific time.)

The issue with the original phrase is that "middle" is an adjective, not a noun. We need to use "the middle of the night" as a noun phrase to correctly modify the preposition "at".