It may happen when your brain gets confused and you're out of rhyme or don't have much time or your heart's not in it so you give it a try and your get up and go gets up and says 'bye.' When inspiration has decided to flee, don't take the flight so personally. There's always something to give you a lift, some magical way to steer through life's twists. Just remember those poets from olden days found their inspiration missing in a troublesome haze... when the rhyming muse is nowhere to be found and words that used to flow sink underground, just keep the faith and before you know it you're back to being a full-fledged poet. Believe in yourself and your gifts are enough to show everyone you still have the write stuff.