It's dark, it's late,
And way too early.
Nightmares haunt me,
Destroying anything innocent that’s left.
The siren wakes me,
From my shallow sleep.
I'm here still,
Fighting a war for my peace.
Its dark it's late,

It's dark, it's late, This seems a little redundant to me - the 'it's dark' suggests that it's late and I think this space could be used for possibly more description - instead of telling us that it's late, show us and set the mood.
And way too early. Interesting line but I think I'm missing something - I don't fully get it? I'd expand on this.
Nightmares haunt me,
Destroying anything innocent that’s left. Too vague. What's this 'anything innocent'? Soul, mind, body? What about the 'left'? What happened that destroyed the rest? Sex, murder, etc? I'm not telling you to just state it, but a couple of hints or something to make the reader care. Otherwise it's like, so what.
The siren wakes me, Literally? Either way it needs more explaining.
From my shallow sleep. I like this.
I'm here still,
Fighting a war for my peace. I get what you're saying, but I think it could be developed further.