Probably the most comfortable sleep on a plane in a long while. LAN offers a comforter inside a sheet- sort of like a sleeping bag. So you lie on the comforter under the sheet. The lighting is unusual prevelant pinks and blues and i am told the humidity is pumped up so one sleeps more comfortably. I did not wake up till 20 minutes before we landed in Santiago. We hardly felt the take off and landing. Huge plane!