Been married 5 months and my husband never seems to sleep in our bed,why?

My husband and i have been married 5months and it has been amazing but i have been having a hard time sleeping and i always wake up in the middle of the night because i want to cuddle up with my man but he is never in bed i always find him on the couch or the guest bedroom and i don't understand why i am kind of hurt. I asked him about it and he said he just feels wearied being in bed with someone else and that he can't get comfortable and such. I don't know what to do thats the only really thing that is wrong everything else is perfect. Did you have to deal with this? How did you get your man to come to bed and such? Advice?