Giggs started the game with Juan Mata on the bench.
When asked whether he slept on Friday night, Giggs was candid in his response.
"No," he said. "Leaving out players was the reason I didn't sleep. They are team-mates of mine and I've never done it before.
"It was a tough one to leave Juan out. But he put on a half-hour master class. He was brilliant and I was really happy for him.
"It's not easy, he's got a big price tag and to not start the game was disappointing for him.
"I'll continue not enjoying (leaving players out); that has been the hardest part this week."