Uy, yan talaga ang struggle namin dati with my eldest! Ang nangyari sa amin is we had to be super consistent, gising kami sa umaga kahit konti lang tulog niya, walang tulugan sa bahay during daytime para ma-adjust ang body clock niya, at enforced bedtime routine every single night kahit medyo mahirap muna. A few of us moms tried giving a small snack or milk before bed din, and gradual lang talaga ang adjustment pero after 2-3 weeks may improvement na, kaya don't lose hope! I'd suggest checking with your pedia though para sure walang other issue na causing the reversed sleep cycle, lalo na at 2 years old pa lang siya.