Yes, it is quite common. Fanfiction writers often use this scenario to explore the relationship between Bella and the Cullens. It gives an opportunity to show the Cullens' caring side towards Bella.
In some fanfictions, when Bella falls asleep at the Cullens', she might have vivid dreams. These dreams could be related to her relationship with the Cullens or her fears and hopes. For example, she could dream about a future with Edward where they face no more obstacles.
Another theme is the exploration of their relationship. Falling asleep together is an intimate moment. It allows the author to show how close they are, how their feelings for each other have grown, and how they are more than just friends or allies. It's a way to show the depth of their connection without necessarily having a lot of action or dialogue.
One common plot point could be the Cullens isolating Bella at school. They might spread rumors about her or use their popularity to make her an outcast. Another could be them using their supernatural abilities to intimidate her, like Edward using his mind - reading to embarrass her in front of others.
Well, it depends. For some people who are really into science fiction, they might be so engaged that they stay awake until they finish the book. But for others, especially if they are tired, the sometimes - dense concepts in science fiction can make their minds drift off. It's like when you're reading in bed at night and your eyes start to feel heavy, and before you know it, you're asleep.
She might start by giving them the silent treatment. Just ignoring them completely when they try to talk to her, which would be a very human way of showing anger.
Well, it could be due to the way the Cullens interact with the other people in Forks. If Bella notices that they are being manipulative or using their powers in a way that she doesn't like to influence the townspeople, that could make her start to hate them. Also, if there is some kind of power struggle within the Cullen family that starts to affect Bella negatively, like she gets caught in the middle of it or she sees how it's causing harm to those she cares about, she might turn against them.
It could be another vampire clan. Maybe they are jealous of the Cullens' interest in Bella or they think that Bella's presence among the Cullens will disrupt the balance of power among vampires. So they try to get Bella from the Cullens, making them the main antagonists.
It could be that the fanfiction writer took a different approach to the story. In some fanfictions, the Cullens could be involved in situations that go against what Bella stands for. Perhaps they are written to be more secretive and untrustworthy, leading to Bella's hatred.
I'm not sure specifically as there could be many different takes on it. Generally, it might be about Bella using her singing in a context related to the Cullen family in a fan - created story.
In some fanfictions, the Cullens might hate Bella because of jealousy. Maybe other vampires are jealous of the attention she gets from Edward. Another reason could be that she brings too much danger to their family. Her presence could attract unwanted attention from other vampires or vampire hunters, which puts the Cullens at risk.