Do we really need 8 hours of sleep?
Most of us need 7 to 8 hours - not only to be sharp, but to also fend off mood disorders and even metabolic problems. Most folks who don't snooze long enough just get used to feeling sleepy and preforming suboptimally. Is that where you want to be?
When is it too late to go back to sleep?
If you need to be up in less than 90 minutes, it's better to just get up. We usually wake up during the lightest stage of sleep which occurs about every 90 minutes. So if you can't get an additional 90 minutes, you'll likely wake up from a deeper sleep stage feeling groggy.
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