Well, that is strange that it only happens during the day and not at night. I suppose we could come up with lots of possibilities, but finding something that is probable is another issue. When I take an afternoon nap I'm usually more comfortable than sleeping at night. But I only sleep for a 1/2 hour or less. I sleep in on my side which I never do at night because longer than 30 minutes on my side would be asking for more misery.
Hope you can come up with a reasonable answer,
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