Ay, 12 hours na tulog mo every night? That's actually quite a lot, mama, most pregnant women at 35 weeks need around 8-10 hours lang kaya baka need mo talaga ng extra rest ngayon dahil demanding ang third trimester. The sleep itself shouldn't harm baby, but I'd really suggest checking with your OB about this, especially kung pakiramdam mo abnormal yung shift ng body clock mo or kung may accompanying symptoms like dizziness or mood changes. A few of us pregnant friends nag-experience ng weird sleep patterns din, pero once nag-explain sa doctor, naintindihan namin if it's normal third trimester stuff or something na kailangan i-monitor. Basta make sure you're eating well between sleep-wake cycles at staying hydrated, okay?