twin sleep problems

hi i have 5 month old twins they have terrible sleep habits when the were born their bodies were mis alligned but many visits to an osteopath sorted this issue but because they were 3 months old when we visited the osteopath their bad sleep habits were already developed and now we cant get them out of them. they have been weaned already and that makes no difference to their sleep so its not hunger that wakes them. they very rarely nap during the day for longer than 20 mins max and a night will wake every 2 hours each if not more. can anybody help me break this habit???