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Harvard Health Letter

How much sleep do we really need?

Ask the doctor

Published: August, 2019

Q. How much sleep do we really need, and what happens if we get too little or too much?

A. We spend about a third of our lives sleeping, so you've asked an important question.

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Daily Health Tip

Memorize the warning signs of a stroke

The acronym FAST can help. F: Face drooping. Can the person smile? Is the smile uneven? A: Arm weakness. Is one arm weak or numb? If the person raises both arms, does one drift down? S: Speech difficulty. Is the person's speech slurred? Can they repeat simple sentences you give them? T: Time to call 911. If the person shows any of these symptoms, even if the symptoms go away, call 911. Check the time so you know when the symptoms began.