Well I wouldnt say its normal but it happens alot usually because the plant is reaching for light.Prop it up or tie it to a piece of bamboo and get a fan in there asap it will strenghten the stem and in about a week or two it will be strong enough to support itself
Okay propping it up might keep the plant up, but that doesn't solve why the plant is down. Have you watered it recently? Could you provide pictures? Any other information you could provide?