Amen to that, sister.
Last night we had the reverse problem - humidifier plus kids playing with the heating controls during the day meant his room was a little sauna!!! Sigh, can't get it right!
I'm going to try the blanket under the mattress thing.
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We used a wheat bag. Only takes 1 min in the microwave and stays warm for awhile. We placed it where her head and shoulders would go and just whipped it out before putting her back to bed.