The day before Whitney Houston was found dead in her bathtub at the Beverly Hilton, her daughter, Bobbi Kristina, fell asleep in a bathtub in the exact same hotel, TMZ has learned.

According to TMZ sources, friends of Bobbi Kristina tried knocking on her door repeatedly Friday night, but she didn't answer. They then called security to get them to unlock the door and help them get Bobbi out of the tub.

Our sources say it happened on the same floor of the hotel where Whitney would be found dead the next day. We're told the room Bobbi Kristina was in was booked under Whitney's name.

Bobbi Kristina has been hospitalized twice since her mother's passing and TMZ is told her family fears she might be suicidal.

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