Learning Torah while laying in bed

Q: Is it permissible to learn Torah while laying in bed or on a couch?
A: One must learn Torah in awe, fear and trembling (Berachot 22a). This idea is also found in the Mishnah Sotah (9:15) that we should learn while standing for the honor of Torah (see Megillah 21a). In truth, it is proper to learn Torah only while standing but we do not have the strength and we therefore learn while seated. But even while seated, we must learn in an upright position and with an awe of holiness. One should certainly not learn while lying down. But if someone is sick or tried and needs to lie down, it is permissible to learn while doing so. In other words, when we learn, we do not need to lie down but when we lie down, we certainly need to learn.