Is this grammatically correct? What does it mean and can it be rephrased? “It has always been a case of going to bed late and waking up so early”

Yes, the sentence is grammatically correct. It means that the speaker frequently has the habit of going to bed late and consequently waking up very early the next morning. Here are a few ways to rephrase it: 1. "I've always had a habit of staying up late and waking up very early." 2. "It has consistently been about going to bed late and rising early." 3. "The pattern has always been staying up late and getting up early." 4. "I've always found myself going to bed late and waking up early." Each of these alternatives maintains the original meaning while using slightly different wording.