[cypher]

A week isn't long for Humphrey to have settled in, he may just need more time.
Was he handled when he was with the breeder? If he was then when he wakes I would try coaxing him into something you can transport him to a safe play area & spend a little time interacting with him there, he may do better out of the cage.
If he isn't used to being handled then he may need a little longer to settle & adjust to his new home, you could try gently waking him a little earlier than he normally gets up by gently rustling a food bag of the substrate or making that a regular time for giving him some treats or his veg that may draw him out if he keeps doing a no show until very late.