'Hyper' movie star Kristen Stewart

Kristen Stewart says premieres make her hyper.

The 'Twilight' actress says after she has attended a glitzy event she feels full of energy and can't switch off from the excitement of the red carpet.

Speaking at the premiere of her new movie 'Welcome to the Rileys', Kristen told People: "By the end of the day I actually get really hyper, because it's then that I have my own time."

The 20-year-old star - who plays Bella Swan in the 'Twilight' films - also revealed premieres mess up her sleep pattern.

She added: "You end up staying up all night and then screwing your morning the next day because you need time to yourself."

As well as missing much-needed rest, the red carpet is also taking its toll on her feet.

She joked: "I feel like my feet are really p***ed off at me, just because of the shoes. That's the biggest problem."

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