Oo, totoo yan! A few of us here do side-lying at night kasi mas convenient, pero ang problema talaga is kung hindi ka nag-adjust ng pillow properly or naka-curve ang spine mo habang natutulog, sobrang masakit ng lower back pagkagising. Try putting a pillow between your knees at isa pa under your bump para ma-align ang spine mo, kasi pag collapsed ka habang nakaside-lying, yan talaga ang nagpapain sa balakahan come morning, mama. If the pain persists though, baka check mo with your OB or pedia kasi sometimes it's not just the position pero something else na kailangan bantayan during breastfeeding.