I just have a question for all you experienced Bengal owners out there.

My 4 month old boy Percy is a beautiful boy, he loves cuddles when I get home, loves being picked up and given kisses and at night times he loves to come up and get some kisses and cuddles. However mainly in the mornings and late at nights he will come up to me for his kisses and cuddles and after a few minutes he will just turn feral and wrap his legs around me and attack me. he lets out an angry growl. I don't do anything to provoke him, he just does it un provoked. I have read on here about biting and when they bite whilst playing distract them by giving them a toy or something. but he doesn't do it during play time, only when he comes for cuddles at nights and in the mornings. When he does it the only way to get him off me is to flick his ear or give him a tap on the nose and tell him no.

Has any one experienced the feral side to your Bengal and if so how have you solved this problem?

It does sound like he is being overstimulated. The substitution for a toy when this happens is still a good idea at his young age.
He is not feral, nor is his behaviour, so don't worry about that being an issue.
My boy is 14 yo and occasionally will 'attack' me when having a kissy / snuggle on the stair landing, but as soon as I move away he calms down and comes back as if to say 'Sorry Slave, I forgot your place.....' and then gives me more kisses.

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The little monsters 3

Mine loves to wrestle toys and sometimes when I'm rubbing his belly, he will start thumping my fingers and wrap his front paws around my arm, but doesn't do anything else. No biting, no scratching. Mine also loves to play and would play 24/7 if I had that much time to play with him. Your kitty is still a baby and kittens are wild at times. I'm thinking this is normal behavior and his signal that he wants to play. My boy is almost seven years old and he still gets so wound up at times. I'd distract his attention from my arm to a toy-- so have one handy. Cats don't understand punishment. He doesn't think he's doing anything wrong. Mine understands the word "no" because he talks right back to me every time I say it -- he lets me know his displeasure. Yours may grow out of this eventually, but my experience with kittens is that they get "strange and wild" sometimes. What calms Raiden down is a walk outside on a harness and leash. He always comes back in and crashes!