A woman says she's a real life Sleeping Beauty thanks to disorder which sees her nap up to 22 hours a day.

Joanna Cox, 38, once slept for four days without waking up due to idiopathic hypersomnia.

She was diagnosed after years of excessive sleeping and struggling to stay awake during the day.

The rare condition leaves sufferers with extreme daytime sleepiness – often resulting struggles to wake-up and feeling "unrested" and "mentally foggy".