Maybe I'm an over worrier...But I dont like to leave the window open even when it's on the latch...(When it's open on the latch barely any air gets in anyway.) Also dont like the idea of plugging a fan in as I feel my son (2 & a half) will play with it...He has quite a small room...And i worry hes too hot at night...What can I do?...Obviously I've dressed him appropriately & gave him thinner cooler bedding.But he still seems fidgety & warm in this weather...