Uy mama, alam ko yan, 32 weeks is when the back pain gets real talaga, especially sa gabi when you're tired na! A few of my mum friends swear by pregnancy pillows (yung body pillow type) to support the left side at lower back, plus they sleep on their left side anyway which is better for baby, so win-win; also try warm compress before bed kasi nakakaginhawa, or pampering yourself with a prenatal massage if kaya ang budget. But since it's consistently painful every evening, I'd really suggest bringing this up with your OB next check-up para ma-rule out kung hindi lang it's the normal pregnancy aches, sometimes positioning and pillow support helps a ton, pero better safe na checked by your doctor especially if it gets worse, alam mo na.