Smelling the shirt of your partner can improve the quality of sleep suggests new research. The research was conducted by researchers of the University of British Columbia. The researchers found that study participants who were exposed to their partner's scent overnight experienced better sleep quality even though their partner was not physically present. Our findings provide new evidence that merely sleeping with a partner's scent improves sleep efficiency. Our participants had an average sleep efficiency improvement of more than two per cent said the lead researcher Marlise Hofer. We saw an effect similar in size to what has been reported