Baby fell off the bed

My baby fell off the bed and now both nostril is bleeding. She was crying at first but her dad is holding her and keeping her calm. She isn’t crying anymore when her father is holding her. I’m a FTM. It’s her first nosebleed, also bed time. I was told people can drown in their own blood if they lay down. Do we keep her upright? For how long? How do we know it’s not broken? Should she not sleep too? Because I heard if babies fall, try not to make them go to sleep.