Did he ever sleep in your bed before? I assume that he slept in a crib until recently and now that he is in the big bed, he is more mobile and can now get to your room, whereas he couldn't before.
I am no expert here, but I will be facing this situation shortly--my daughter is 23 months old and we are expecting a new baby in April and hope to have the eldest in her own bed by April or shortly thereafter. What I would do, however, is EVERY TIME he appears in your bed, get up and take him back to his room and put him in his own bed. EVERY SINGLE TIME. If he gets away with it once, he will think it's a regular thing, and it will be even harder to break the habit. Also, some other advice I have heard is to let him pick out his own sheets, and have him help you make the bed up, to kind of give him "ownership" of the bed, and thus maybe make him want to sleep there. Also, is he scared of the dark? If so, maybe you should get him a nightlight and plenty of stuffed animal friends (let him pick) to keep him company. Just some ideas, from an amateur. Good luck, and let me know how it goes. I am trying to gather information/ideas for my own future parenting efforts!
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