A newly expanded medical unit at Sha Tin Hospital could make patients' dreams come true. The unit is a referral centre for insomniacs, snorers, sleepwalkers and those who doze off at work, on the MTR, or even behind the wheel of a car. With a two-year waiting list, many patients have spent a lot of sleepless nights and sleepy days without diagnosis, but psychiatrists hope next month's expansion will sort out disorders speedily. The sleep assessment unit is moving from the Prince of Wales Hospital to Sha Tin Hospital and will see its number of beds increase from one to four. Professor Chen Char-nie of the Department of Psychiatry said he hoped the three extra beds would allow quick diagnoses and cures for ailments including sleep apnoea - a sudden inability to breathe, associated with snoring - insomnia, nightmares, too many dreams, and sleepwalking. 'In most cases of apnoea it is the patients' family members who have noticed their illness. Some of the wives can't put up with their husbands' bad snoring and demand a divorce,' Professor Chen said. People with severe apnoea could stop breathing 600 times a night, he said. 'Apart from medication one of the treatments is to require patients to wear oxygen mask during sleep because they have insufficient amount of oxygen in their blood,' he said. A study carried out at the hospital between 1984 to 1986 found that 14 per cent of the local population reported various sleep disorders. Some four per cent had sleep apnoea.