Nursing to sleep... is it a bad habit?

Michelle
My baby girl passes out every night after nursing around 7:30pm and sleeps until I have to wake her (she nurses 2 times during the night...usually 12:30am and 3:30am...in which she never fully wakes) at 6am to go to daycare. Am I creating a bad habit of nursing her to sleep? It's just so easy! No bouncing or rocking necessary...