Answer:
What has a neck but can't swallow?
What has one hand longer than the other, and goes on all day and night?
Is always in front of you but cannot be seen?
Mary's child slept in one of these
What goes trough your head but you forget it like 3 days after?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.