[PurpleKat]

My dwarf hamster too has decided to sleep outside her bed into a corner.
Cool tiles help, even if it's just the cooling of the air near them.
Watery food like fruit and cucumber, good in small amounts to not upset tummys.
Ice packs on the side of the cage to diffuse the cool threw the plastic sides.
Change water daily and add a couple of ice chips to keep chilled.
Ceramic hides are nice too, mine do go inside them for a bit to clean.