I used to need vast amounts of sleep as a teenager, when I was also having a lot of emotional turmoil. Sleep can level out the effects of stress, or at least help. If your nervous system is more prone to stress like mine is, it can be that you require extra sleep. Some people are simply born with different sleep needs.
I get sore eyes on waking when I slept too little. I also do not feel too well if I sleep like 10 or 12 hrs, then I actually feel less rested than after 8 hrs. In sleep you also move your eyes rapidly during REM sleep - if you have many dream phases you have more of these phases. If your eye muscles are tense or nearly strained, this might explain why your eyes are sore upon waking up.
I like CF's suggestion, it's splendid advice if you can pull it off.
I wish you a good night's sleep!
Oliver
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