In the last few days my dd (2.7) has started to take longer to drop off in the evenings and is waking earlier. She used to go from 6.45pm - 7.15am no problem, but for the last few days she has been singing away in cot til after 7.15pm and awake at 6am. Is this her way of showing she no longer needs a sleep in the day and because she's getting a sleep is cutting down at nighttime??