Answer:
The time between daylight and darkness when blood drinkers like to come out
I have a mouth on my head and eat everything.
I open to close but I close to open. I'm surrounded by water but I'm never soaking. What am I?
I can be sweet or sour. I do not rhyme with any other word
I am the kind of nut that is empty at the center and has no shell.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.