Very Interesting! I have always noticed that my crew has sleep stages. If they are disturbed during sleep, even of they seem to stay asleep, they are "cranky" (for lack of a better word) the next day. We had a big storm the other night, lots of thunder and lightning. I went to check on everyone- all 3 chams had eyes tightly shut, nighttime colors showing. The next day however I noticed a definite change in behavior. They all had a "leave me alone" vibe. Hopefully they'll all dream of their silkworm dinner tonight...