Uy, same experience kami dito! Ang 1-2am wake-up phase na ito ay super common sa 19-month mark, parang may developmental leap na nangyayari kaya ang brain nila ayyang-yang sa gabi. Since hindi sya umiiyak at playful lang, baka natural sleep regression lang talaga, a few of us tried pag-extend ng bedtime routine with extra cuddles or quiet play instead ng forcing sleep, at parang nag-settle sila after a few weeks. Yan kasi ang frustrating part, walang quick fix talaga, pero checking with your pedia won't hurt if this goes on for another month or if napapagod ka na talaga sa pattern, kasi sometimes may other triggers like ear infection or reflux na hindi obvious.