Do I have reasons to worry about my 8 month old boy because of this....?

I totally agree with cutting out the nite feedings too. He's getting his days & nites mixed up. Of course he's not going to be that hungry if he's eating at nite too. He can't be expected to eat nite AND day! Try cutting out the nite feedings & see if he's more hungry during the days. Try it for awhile & see IF that does help. If YOU ate during the nite, you wouldn't be that hungry during the days either. Even YOU couldn't eat 'round the clock. Mommy, he WILL be FINE, trust me...:)