Your voice in the night has a sound all its own.
We sing and talk in our sleep and our dreams. We come up with lyrics, melodies, creative solutions to problems, direction for life. The subconscious mind is freed up to explore in ways that the controlled, awake, conscious mind cannot. The problem is that the conscious mind soon overtakes, controls and sublimates the subconscious mind pretty soon after we wake up.
There is cool way to capture and use your voice in the night, suggested in a great book for creators called "The Artist's Way" by Julia Cameron. Her concept is called "Morning Pages". To put it in a more earthy way, t's a brain dump. You write three stream of consciousness pages of unedited words FIRST THING in the morning before your conscious mind takes over.
Odd things appear in morning pages. Sometimes it's just nonsense, sometimes it's a brilliant idea, a creative solution, a secret longing of the heart that you've squashed or a persistent worry that really needs to be worked out. At the very least it frees up your conscious mind by untangling some of the subconscious threads of thought.
Another way to capture your night voice is to have a pen and paper pad next to your bed. Those 3:00am musings can be quickly jotted down when they wake you up before they turn into half-remembered jibberish later in the morning.
Try listening to your night voice, especially if your day voice feels uninspired or stuck. It has sure sung some great songs for me.