The We're Going On A Bear Hunt writer, 74, spent 47 days on a ventilator after being admitted to hospital in March.
He said doctors "handed me a piece of paper and said you've got a 50/50 chance", to which he asked "are you telling me I might not wake up?".
The ex-Children's Laureate said he was told "'Yes', then I signed something."
He recalled: "I think I was a bit light-headed but I remember thinking 'oh well a 50/50 chance'. I was quite sort of flippant to myself about it really."
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