We follow the same routine as we always have, and now the younger one (20 months) follows same. Always worked up until now - up to bath and bed at 6.30pm, leisurely bath then I put 20mth old down in her room with a couple of books while older sits reading through a couple of books in her bed, then I go in and read 2 books to her while she drinks a cup of milk, then light off about 7.15pm. Only in last 3 or so weeks she's then back up, light on, running up and down hall, sitting in our bedroom with random clothes on that she's found, generally messing about. Have tried all types of responses, nothing works. This often goes on until 9pm... Then she's super tired in the morning and grouchy. Any ideas welcome please!