"When I was younger my teachers thought I was naughty and 'away with the fairies'. But I was having absence seizures," says Olivia Salvati, 21.
"It's not like daydreaming - it's like having a horrendous nightmare that leaves you feeling completely drained."
Olivia found that her absence seizures - a type of epilepsy - meant she was often perceived as not concentrating.
To raise awareness, she is fronting a campaign by the charity Young Epilepsy to help educators recognise the signs.
The charity says most schools in the UK will have at…