3straws, how old is your hedgehog? Is he still a baby, or did you get him as an adult?
Either way, have you checked his weight to see if he's losing, gaining, or maintaining?
A baby hedgehog might have had quilling/new-home adjustment problems that happened to resolve themselves at the same time, leaving him a much happier animal. Babies also sometimes bite people they're intensely curious about--it's kind of an over-enthusiastic extension of sniffing. Still, that doesn't explain the changes in his sleeping patterns, particularly since they're the opposite of what you'd expect from a hedgehog.
Even though his personality (mostly) seems friendlier, I'm concerned he might be ill. It's not typical for hedgehogs to allow people to do absolutely anything with them. Even the friendliest will ball up over something sooner or later. Add that to the facts that his sleeping pattern is also abnormal and he's suddenly become a biter, and you have a picture that suggests you have a hedgehog that's suffering in some way.
Personally, I'd take him to the vet ASAP whether he showed other signs and symptoms or not, but you might want to check to see if:
1) He's lost weight
2) He appears restless during the day, as if he's trying to find somewhere to lie down and feel comfortable, but can't
3) His poop has turned green, tarry black, or gone through some other notable change
Generally speaking, it's a good idea to get a hedgehog checked out if their behavior suddenly changes in any way, even a "good" way. Hedgehogs hide symptoms of illness, and you sometimes have to look for very subtle things to discover they're sick.
