I would still tend to lean to a low iron or thyroid before the autism/developmental delay route. If he is falling asleep and lethargic it would more likely be the iron/thyroid which would greatly affect his ability to interact and speak and engage. Children with autism and developmental delays, in my experience, tend to be difficult sleepers and wouldn't usually just doze off.
I have low thyroid myself and it does put you in a zombie state where you just feel like your body is made of lead and the energy it takes to follow through with a request can be a lot. So...imagine that on a 2 yr old..in a new environment and what you describe behavior wise makes sense to me.
I'd start there before thinking autism.

































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