Disclaimer: I own nothing of Dragon Flyz, which is owned by Gaumont Pictures. Only the plot is mine and I make no money from this.
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Though actual storms on Airlandis were rare, they did happen occasionally.
So while Sky Fury herself was able to sleep through the one that came up on the floating city during the night, her cub was another story.
At the first crash of lightning, Zap was startled awake with a squawk. He stared up at the ceiling of the dragon sanctuary, wondering what that had been.
The roll of thunder spooked him, causing the still small cub to press back against his mother. The following crash of lightning scared him into diving under her wing for protection, which finally woke the large green.
She sleepily looked at him, wondering what this was about. The sounds of the storm outside told her, well, that and her cub's startled squeak at the next flash of lightning.
Settling back down in the nest, she sent her baby soothing sensations alongside a pretty tune she remembered from Summit's mind. It took a few minutes, but she finally had him relaxed enough to go back to sleep, despite the storm.
Laying back down herself, she yawned and quickly fell back asleep, ignoring the raging sounds from outside. She'd flown in worse after all, so why should this little annoyance disrupt her slumber?