Some writers do their best work with their morning coffee, others with their dinner wine. Schedules can be so complicated that the time made available to write may not be the best time. If you are a morning writer, but only have free time in the evening to write, try to rearrange your schedule for at least one day a week, so that you can write when you are at your best. This can be difficult at first, but well worth the effort, and easier to maintain once you have established a pattern.
At the same time it is important to allow yourself time to write during your favorite part of the day, it is also important to do the opposite. If you are a morning writer and always write in the morning, try mixing it up occasionally. What happens when you write at night? Does your writing become softer or does it become more energized? Being aware of how the time of day impacts your writing can serve as a great tool for strategizing your way through a writing barrier.