The issue of what players take to get to sleep has become a discussion point after
Another England player admitted some then took sleeping pills to counter-attack the effect and allow them to get to sleep after the postponement.
"I think some players do take sleeping tablets at night," said Ferguson.
"I don't know which ones. There are all different types and some very mild ones. I leave it to the doctor."
Ferguson clearly does not believe it is an issue, judging by the jovial way he responded to a further query about whether his players take caffeine tablets.
"I don't think so," he said. "It's me that's needing them.
"I wish I had taken a sleeping tablet before this press conference. It would have made it a bit easier."
English Premier League
Real Madrid ambassador