I keep the curtains closed in the bedroom too,
The sun is on the back garden all afternoon, and our bedroom
is at the back, it's like an oven at bedtime,
My fan is on full blast, OH, is downstairs with the dog, so the plus is
I've got the bed to sprawl out on all by myself....lol
OH said it does get lovely and cold about 3/4am, and he loves it.