If he's relaxed and doesn't have his head in a position where it needs to be held up to stay there, and he's been like that awhile without moving, he's likely to be asleep. If I wave my hand in front of his face or move around the room and he doesn't react, he's asleep. If I scratch on the side of the cage with my fingernail and he doesn't react, he's asleep. If I scratch a bit more, and eventually he does react, then I just woke him up. I try not to wake him up if I don't need to.
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