It's quality over quantity...
It's been shown that sleeping for 12 hours from 1am-1pm is not as refreshing as sleeping 6 hours from 11am to 5am.
If you're finding it difficult to sleep, or that your sleep isn't restful, consider 'shifting back' your biological clock so you sleep at 10 or 11pm. It worked wonders for me when I was in 1st year (but I haven't done it in later years), I woke up at 5am every day like clockwork.
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