I got Meka at 9 wks... I had to put her in a childs playpen w/ pad etc... and placed it next to my bed. I did this for a couple weeks until she was comfortable at night... They also have stuffed animals w/ heart beats, to help them feel secure when your not w/ him
Just remember he's still a baby and has just been seperated from his mommy/litter mates... he needs comfort. He doesnt have to sleep with you, but maybe at least near you