Healthy , full-term @ - to @-week-old infants were randomised to sleep either in a commercially available hammock ( n = @ ) or a standard bassinet ( n = @ ) , and sleep state , oxygen desaturation ( a fall in peripheral haemoglobin oxygen saturation ( SpO@ ) @ % , for @ sec from baseline to nadir ) , apnoea and hypopnoea , and mean SpO@ were analysed .