How do you get your four year old to sleep in his own bed instead of in your bed?

Make his bed fun! They have tent kits to put on toddlers' beds. If he feels as though it's an adventure to be in his own bed, he will likely be willing to sleep there. I bought a "CARS" theme tent for my son's bed. He absolutely loves it! A night-light is always a good idea too. Perhaps some glow-in-the-dark stars on the ceiling. Anything that makes his bedtime special.