Take one old long-sleeved T-shirt (or 2 old short sleeved ones) plus an old towel.
Chop off the sleeves.
Cut the towel into 3, fold and roll and make a 3 division pocket with the sleeve material.
With remaining sleeve material make a large pocket and sew to the back of the old T-shirt.
Insert the rolled towels.
Put T-shirt on when in bed and, hopefully the uncomfortable back pack will stop the wearer rolling over onto his back so eliminating snoring and enabling the wearer with sleep apnoea to breath properly.
I'll let you know how DH gets on.
DS who has inherited the condition sleeps with a towel stuffed back pack on! :}