[Livia]

Like everyone's said it's all down to what's in your contract... and bear in mind you cannot amend a written contract with a verbal one, so what they've said since your contract counts for nothing if it contradicts the contract. What does your contract say about sick leave?

If they did sack you, you will only be able to claim unfair dismissal if you've worked there for two years or more, with certain exceptions.

Lack of sleep is serious. They use it as torture.