What does 1 Samuel 3:6 mean?

The Lord called out to Samuel again, just like before. Samuel got up, went to Eli, and said, 'Here I am. You called me.' But Eli answered, 'I didn’t call you, my son. Go back to bed.' 1 Samuel 3:6 - Modern Text Bible

(Samuel still doesn’t realize it’s God speaking to him, so he keeps thinking Eli is calling. Eli is confused too.)