Washington, Sept 11 (ANI): Former Beatle Sir Paul McCartney is amazed he and his band mates survived the excessive drug habit they had in their heyday.

The singer admits that the Fab Four overindulged in drugs, often falling asleep during recording sessions.

“(We were) overdoing substances and really getting crazy, as we all were… (We’d be) falling asleep - the kinda thing when you can hardly get your head off the pillow. You go, ‘Woah, I’d better get my head off this pillow,’”

McCartney was quoted by Contactmusic as saying in the U.S. news show Entertainment Tonight.

However, the 67-year-old star also confessed it was during on such drug session that he wrote the Beatles classic Let It Be.

He said: “I had a dream, where my mother, who had been dead, by then, 10 years came to me in the dream and was very sort of helpful and very calming, and it was lovely just to see her… and she said, ‘Don’t worry about it… Let it be.’

“I went, ‘OK’, and I felt so good… and I woke up and wrote Let It Be. I thought, ‘That’s a good idea for a song.’” (ANI)