Cat won t let me sleep what is wrong?

Every night i go to bed at midnight on rare instances one. When I go out cat will follow me and sit outside my door and meow and scratch for a while before she leaves me alone. I don t actually go to bed at this time I sometimes an kept awake for a while thanks to weather scaring me or because I can t sleep. Anyways around seven in the morning my friend gets home from work and heads for bed. Around nine to ten in the morning the car starts meowing outside my door again. It s bugging me and I haven t gotten good sleep recently because of this but, I don t want to get rid of her or anything like that. Please help I should also add that she had plenty of food and water and her litterbox is clean.

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