Cannot stop the late night craving! (waking up middle of the night)

For unrelated reasons I've been waking up a lot in the middle of the night (at least I assume unrelated) and I am RAVENOUS.

I eat celery/carrotts/peppers because that's the best thing I can think of that wont just digest and stay in my fat cells while I'm sleeping.

But how can I help waking up ravenously hungry??

Please and thanks.