somehow he feels lack of security. did he sleep

like this since born? did he ever scare to anything special? check your insurance plan for "pediatric behavioral specialist". if doctor says it is ok, try to train him to do things more by himself: let him play by himself while you are in the same room, then slowly in the other room but he can see you; let him sleep in the next room with door adjar, many times young kids actually sleep better if parents are not in the same room. he maybe wake up during the night, but he need to learn to back to sleep by himself. you can place one or two his favorite stuffed animals near him as his "guard"...