。
I don't always wake up early.
Literal
I [topic-は] always early-rise do [it's not that-わけではない].
いつも…わけではない 'it's not that I always...' — a partial negation. This is a textbook-quality sentence for demonstrating the difference between 'not always' (部分否定) and 'never' (全否定). Natural despite its pedagogical utility.