Weight Balance
On my way back from SJU, I had a bit of a hang over and wanted to get some sleep. So I wondered from my spot in 1C to the last row which was empty I lay down across all three seats and fell a asleep. A few minutes later a FA woke me up and told me I had to go back to my seat because of weight balance. On an A319 does one person moving from the 1st to the last row really matter?