Help!!!

My daughter (5 months) has been a great sleeper. She was falling asleep by herself and putting herself back to sleep when she would wake up. Always in her bassinet at night. However, this past week she will ONLY sleep in my bed next to me or my husband. The second we place her into her bassinet she becomes inconsolable. I literally can’t calm her unless I pick her up. The. she relaxes and goes right to sleep. The cycle continues until I give up and just lay her with me. I am at a complete and utter loss and have no idea what is happening or what to do.

Please help!