If he was sleeping soundly and wasn't cold, I wouldn't worry too much! Sometimes I think we fuss too much over our kids! I babysat my grandkids for a week last month; one morning I found my 8-year-old granddaughter sleeping on the bare floor, no covers. She was sleeping just fine--in fact, I had a hard time getting her up for school!
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey