Aw, mama, I feel you, one of my mum friends went through the same thing when her son was around that age, napaka-draining talaga ng reversed sleep schedule. Kadalasan dito sa amin it's either teething, developmental leap, or nawalan sila ng routine kaya confused ang body clock nila, try consistent nap and bedtime (same time every day!) and i-limit ang stimulation before sleep, pero if it persists, mas better na i-check ng pedia mo para ma-rule out kung may underlying issue like ear infection or something. Kailangan mo rin mag-rest kaya huwag mag-guilt kung kailangan mong tulong from partner or family para kahit kunti lang, makatulog ka. Kaya mo yan, but please don't power through, your sleep matters din!