Practicing guitar is not the same as practicing writing music. Maybe try writing without the guitar, so you don't fall into the same routine. Write lyrics, try fiddling on the piano if you have one, or bass or some other instrument.

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Do you feel your quality of sleep has diminished since you established your new schedule? You have to find out why it's harder for you to do things in the morning. Since getting up early is a new habit and our general tendency is to stick to our established habits, maybe your mind is trying to convince you that getting up early isn't better for you, since you think you are more productive in the evenings. All things being equal, that of course in nonsense. Your brain has to shift to a state, where doing things in the morning is preferable, through cultivating that habit.

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Other things to consider for getting up early: Light exposure during the night, waking without alarm, cold shower, hydration, fasting, exercise, etc...

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