Recently, a three-year study conducted at the University of Sydney showed that wool sleepwear promoted faster sleep onset than cotton sleepwear. Differences in sleep quality also showed that a combination of wool sleepwear and bedding produced a deeper and longer sleep with participants waking less frequently.
Another study showed that periods of immobile sleep increased when participants slept on a fleecy wool underblanket. Participants reported feeling better in the morning and having improved sleep quality. Similarly, when participants in another study slept on wool-on-sheepskin underlays, they felt they had slept better. Researchers concluded that the wool pile diffused pressure points, provided better insulation to the sleeper, absorbed perspiration better than alternatives, and had a more reassuring handle.
Studies have also shown positive results with newborns. Weight gain in underweight newborns was 61% higher when they slept on a wool underlay instead of a cotton sheet, researchers have found. Jaundiced newborns sleeping on wool were more settled and cried less than those sleeping on cotton, other research revealed.
In a study of Australian preschool children on bedding fabrics and underlays, children who slept in any synthetic bedding in summer or winter were more likely to be reported as having a sleep problem, than those who slept in cotton or wool. – International Wool Textile Organisation