The 30-year-old singer is in The Priory after the stess of releasing his last two albums independently pushed him to become addicted to temazepam and Valium.
A source close to Matt said: “Matt is all over the place at the moment. His last two albums have done well in the charts, but the amount of work he has had to put in has been unreal – and it all started to get too much for him.”
Matt started to use the drugs to deal with the pressures of work, but he soon became dependent on them.
The source said: “In order to calm himself down he started taking Valium and then temazepam, but things got so bad that he couldn’t get up in the morning without taking pills.
“He began to realise he had a problem and decided to do something about it and get clean before his tour.”
It is believed that Matt has started a 28-day programme in order to be well enough for April, when the tour starts.