Posting on behalf of my Dsis.
Her DTs wake every morning at 5-5.30am without fail. They have tried EVERYTHING. Varying daytime nap or stopping it altogether has made no difference. They go to bed at 7pm every night. Even if they go later they still wake at 5am.
When they wake up they are still exhausted but WILL NOT go back to sleep.
They are 18 months.
Any advice??