In the winter, you need a bed warmer to warm your bed against the deep chill.
This can be an electric blanket, or an old-fashioned pile of sled dogs, or even a young woman from the village.
But how do you do chill a bed for those hot summer nights?
Some people strip down to the sheets, crank up the air conditioning, and drink plenty of ice water before going to sleep.
Or, if the young lass from the village is a cold-skinned vampire, well, that will work too. It’s like hugging an iceberg.
Mind the fangs and claws, though.