You poor thing Helen. Really feel for you. Maybe try a bit more stimulus, maybe do floor play with them for 1/2hr in late arvo? when they first wake up, it might wear them out for longer. I spend from 5-7pm filling up Erin n Logan on solids and liquids then give them a lavender bath, finally bottle and then bed. Unless they are teething I don't hear from them for hours, usually?! . They are 1 nxt month so maybe time will be what it takes for you? The more active they are the more tired they will become. As for the night sleeps...are they in seperate cots?
Hope I was some help?? Kim xxx