Recent Sleep Issue in 8Yr Old

Hi moms! I am hoping someone has had some experience with this and has some advice. My 8.5 year old son recently started having some sleeping issues. Prior there were no issues, went to bed on his own and slept through the night. No nightmares to speak of. For the last three weeks he has been saying he can't go to sleep. He goes to bed at 8:30 but now that school is out is will be more like 9. As soon as hubby and I pass his room to go to bed at 11, he comes out of his room and says he can't get back to sleep. The tiniest creek in the floor must arise him and he comes immediately to us saying he can't fall asleep (but he just was). We tuck him back in and ask if be needs anything. We have offered him a nighight, music, anything that he thinks will help him. No change. Then he comes to us at 1am. Same story. We have tried lying in his bed and leaving when he is asleep. He ends up waking up when we leave. Every night he ends up in our bed (sleeps like a baby but it is too crowded). Tried having him bunk with his twin brother but that didn't help. Have asked repeatedly about nightmares, worries, problems with school, friends, etc but answers 'no'. I checked with his teacher and she said there were no issues that she has seen and she checked with another teacher who is in class a lot and knows my son pretty well. He performed well I school and has made two new great friends. I am a sahm, so I am always around, hubby and I stay involved with sports teams, he has a good group of friends. I cant imagine what is suddenly affecting him. Right now my options that I am considering are: visit to the pediatrician, setting up a sleeping bag in my room for comfort (don't want to seem harsh but since this has gone on for three weeks with no end in sight or explanation I am trying to help us all get some good rest), getting a nanny cam ( just to see how long it takes him to fall asleep or if he really is trying at the 1am wake ups. Obviously the pediatrician is high on my list. Also, not sure if there is some component of sleepwalking as some of his nighttime waking is not recalled the next morning and he speaks unclearly and/or about nonsense. Thanks in advance for any advice
**Additional**he is tired, thats why he gets so upset when he wakes up bc he just wants to go back to sleep. He is very active, playing and swimming outside much of the day. I limit the length of electronics time. he isn't having a problem with the initial falling asleep...it's falling back to sleep during the night hours. He has a ceiling fan that we use but it is quiet. We will try the regular fan for the noise. This weekend it will be a full month of sleep disturbances. That's why we are looking for other suggestions. Just came back from pediatrician. There doesnt seems to be any underlying stress or circumstances that contributed to this. He recommended limiting chocolate and no tv before bed. Recommended a therapist that specializes in sleep disorders to give us suggestions on what might help or what mind tricks he can use to help. Thanks to all for your advice so far!! Every little bit can help or inspire other ideas.