A new sedative drug has been shown to improve the sleep quality and comfort levels of intensive care patients, compared to the most commonly-used medication, according to research published today in the journal JAMA.US and UK researchers compared the effects of the new drug dexmedetomidine with the commonly used sedative lorazepam, both of which reduce the pain and anxiety experienced by mechanically ventilated ICU patients and which help them to tolerate invasive procedures such as the insertion of catheters and feeding tubes.