Day & Night here too. I also have found it interesting reading the different responses...I guess all bubs are soooo very different.
I don't see how it makes a difference to temp as you can get them in different togs & you dress bubs accoardingly...it's 45plus here most days & Charlie has just nappy on under the sleeping bag during the day & suit at night as we have the air cond on cooler as it's easier to sleep. It covers chest & legs no different to rug or sheet.
Charlie is such a mover that we were afraid he'd get caught under rugs etc so it's just him in the sleeping bag in his cot (oh & dummy & small blankie). He was also getting legs stuck etc & sleeping for no longer than 40mins...now he has 3hr arvo naps & at night we don't have to worry about blankets coming off & him waking up cold - he now sleeps through most nights. I love the sleeping bag!!!