We live in Coastal San Diego, so the weather is pretty mild. The lows at night have been about 62 degrees. I've got the heat lamp in there at night from 1030 pm to 6 am. My 5 girls seem to sleep away from it, so I'm wondering if they even need it? Should I shorten the time span? like from 12am to 3am just to cover the coldest part of the night? I'd love to be done with it if I can!