TRMFAM
Chirping
I think it is totally normal they are sleeping under the lamp...we kept ours in the garage and of course I checked on them multiple times in the night and you could easily gauge how warm they were vs the change in night time lows with as much as 10* the first week we had our girls. Some nights piled under the heater, some night several inches around the heater but not directly under it...looked like a handheld fan they way they would line up around it. And many combinations of the two including several inches away from the heater. We did not use a lamp though instead used a sweeter heater.