Reference for Berakhot 48:11

ת"ר היה ישן בטליתו ואינו יכול להוציא את ראשו מפני הצנה חוצץ בטליתו על צוארו וקורא ק"ש וי"א על לבו

Our Rabbis have taught : If one is sleeping in his cloak and is unable to put forth his head because of the cold, he makes a sort of partition with his cloak around his neck and reads the Shema'. Others declare [that he makes the partition] by his heart.

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