The Rebbe expresses concern for the Chossid’s health and sleep, says he will mention him and his wife at the Ohel, and advises checking mezuzos, learning from the Rebbe Rayatz’s talks before bed, and visualizing his image—hoping to hear good news and strengthened devotion in Torah and mitzvos.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/adar_beis/942