They are falling over not drooping. The stem lays over and it bends up to the light.by fall over do you mean there drooping? or they just go horizontal out of the grow medium? Because if there falling out of there grow medium, then yes plant your seeds deeper. I grow in soil, and i put mine maybe an inch in the soil. If your going deeper then that its probably another problem.
Agreed.sounds like the plant growing towards the light to me. Can you post pics?