May Tefillin be placed at the head-position (directly opposite one's head) while sleeping?

Daily LifeTzitzit & TefillinTefillin

Synopsis

Placing Tefillin directly opposite one's head is forbidden even in a double covering and even when one's wife is not present. Placement not directly opposite the head (between the mattresses, offset) is subject to different rules depending on whether one's wife is present.

Rishonim
Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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