I tried out different sleeping positions last night. I take back what I said yesterday about sleeping on the back being the most comfortable because after a little while it gets uncomfortable for the head. This is probably because my head is not accustomed to the increase in blood pressure while resting. There was also more pressure exerted by the bed on the back of my head than with a pillow because a pillow would cradle my head with a greater surface area thus resulting in less pressure on the back of my head. My head probably needs to get used to these two factors which are an increase in blood pressure in the head and the increase in pressure on the back of the head.
Sleeping on the side is definitely not uncomfortable if you have your arm under your head. I seem to have done this with my arm in the lookout posture (Fig. 4 from Tetley's article) instead of the postures shown in Fig.1 and Fig. 2.
If I recall correctly I ended up sleeping in the lookout posture as outlined in Fig. 4.
The back of my neck/upper back is aching a bit today. My body probably needs to get used to the new sleeping positions.
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