I agree with tdm...
One of my newbies falls asleep everwhere too.. Even on her wheel

Cold is what makes hamsters hibernate, not warm weather...
Make sure he doesnt get too cold as he can get ill

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Mummy to:

Oscar and Molly Pooches
Oliver, Lily, Jacob, Sweep, Stevie, Blue, Dillon, Daisy and Flopsy Rabbits
Midnight, Alice, Bethany, Midget, Hermionie, Dora, Valentine, Casper, MJ and new babies!!! Meeces
Dean, Bella, Ruby Hammies