Uy, I totally get it, sleep during pregnancy is really hard talaga, lalo na kung buo-buwan na ganyang pattern mo! Honestly, the fact na you're getting sleep (kahit reversed ang schedule) is actually better than getting none at all, baby needs mama rested, and alam mo yan na rin probably, kaya don't stress yourself pa about the timing, pero since this started suddenly at naging consistent na for weeks, worth checking in with your OB about it para sure lang walang underlying cause na kailangan i-address, like gestational issues or something physical na nabago. A few of my mum friends experienced weird sleep patterns mid-pregnancy and it was just hormones adjusting, but better safe than sorry knowing talaga. In the meantime, if you can, try to sync your schedule with baby's rhythm when you do sleep, some moms find afternoon naps actually work for them, at least you're resting. Seryoso lang talaga, let your doctor know ASAP so they can check everything's okay with you and baby!