Diana could sleep for England

Chart on the left shows my sleep for Friday night and the one on the right, Diana's for Saturday night. Me, less than 6 hours of sleep the bulk of which was light sleep. Diana, over 9 hours of sleep with the greater part of it being deep sleep in fact, she had almost as much deep sleep as I had total sleep! Rosina tried it last night and her sleep pattern is very much like mine but she did get more than 9 hours sleep, lucky devil.