Like previous posters, I take at least a week to recover, I’m 63, but I also suffer from insomnia. My DH takes a day! Melatonin doesn’t work for me. Using strong sleeping tablets when flying is frowned upon as in an emergency passengers can be too drowsy to follow instructions and have slow movements. They can also react differently in a pressurised cabin. I was on a BA flight to Turkey and parents had obviously dosed up their daughter who was around 12 years old. She was near comatose and couldn’t sit up, and we had hit some really bad turbulence. The parents didn’t speak English and staff had to find someone to translate for them, the parents were torn off a strip and told how dangerous it is.