The spring time change can mean waking up a little groggy. But the situation may be worse for many teenagers who appear to be getting less sleep than ever, according to a new report in the Journal of ...
Add Yahoo as a preferred source to see more of our stories on Google. 7-9 hours remains the guideline, but not everyone needs that much sleep. Some need less, some need more. Sarah Mitroff/CNET If you ...
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