Whats happening to me at night?

2 days ago i started waking up with bruises on weird parts on my body like my thighs and back. They are shaped like hands and footprints, its really freaking me out i don't think my family would hit me while i was asleep and im pretty sure i would feel it but i never feel them i only notice them when i wake up in the morning please help me what could this be?? thanks