Your kitten is looking for the warmth of his mother because it gets cold at night. Sometimes a hot water bottle under the blanket helps, but you may be stuck with a cuddle bug until he is older and becomes more independent. Of course, there is no guarantee that he will stop wanting to sleep with you. If you are adamant about him sleeping in his own bed, try using cat nip in the bed or a favorite toy. You can close your bedroom door for a bit to help him get used to sleeping in his own bed. Get ready for some noise for a night or two, but he will eventually get the idea and stop sleeping with you.