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Cali, you're having trouble because your neck is not designed to hold up your head in such horizontal positions for long periods of time. Your head is actually designed to balance on your neck without any muscular support. (Just look at babies when they first sit up. Their heads are huge in comparison to their bodies, yet they have the most perfect posture of all humans, because their balance is so unstable.)
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On a non-sexual note...
You actually do need your spinal and muscular support to hold your head up. Babies don't have perfect posture and hold their head up perfectly... if you've ever held a newborn, you know that if you don't support it's head, it's neck can snap.