Hi my baby is 19 months..he sleeps around 9 p.m and he wakes up at around 7 or 8 in the morning ..but from last mnth he wakes up around 2 am 3 am and starts playing..he sleeps around 6.30 or 7 am ..what to do as this is very problematic and disturbing..he just take 1.5 hr nap in a day only that is btwn 12 to 2..