# Sleeping in = Grogginess, why?

**URL:** <https://boards.straightdope.com/t/sleeping-in-grogginess-why/112498>\
**Category:** Factual Questions\
**Created:** [June 5, 2002, 3:33pm UTC](https://boards.straightdope.com/t/sleeping-in-grogginess-why/112498 "2002-06-05T15:33:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![tarpal](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@tarpal](https://boards.straightdope.com/u/tarpal)\
**Post date:** [June 5, 2002, 3:33pm UTC](https://boards.straightdope.com/t/sleeping-in-grogginess-why/112498/1 "2002-06-05T15:33:50Z")

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Occasionally I get a chance to sleep in. It seems when I do that, the extra sleep is deeper, dreams are more vivid and most of all, I wake up feeling extremely groggy, a feeling that lasts for hours after getting up.

What _is_ grogginess and what causes that slightly headachey, “head stuffed with cotton” feeling?

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**Author:** ![Incubus](https://avatars.discourse-cdn.com/v4/letter/i/c68b51/32.png) [@Incubus](https://boards.straightdope.com/u/Incubus)\
**Post date:** [June 5, 2002, 3:45pm UTC](https://boards.straightdope.com/t/sleeping-in-grogginess-why/112498/2 "2002-06-05T15:45:13Z")

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Not sure, but I’ve heard that if a person gets more than their RDA of sleep, it can actually have a _negative_ effect on the body.

I know that if I get back from my morning shift and take a nap, I’ll sleep exactly 120 minutes, dream very vividly, and wake up feeling groggy for half the day ☹

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**Author:** ![Ringo](https://avatars.discourse-cdn.com/v4/letter/r/779978/32.png) [@Ringo](https://boards.straightdope.com/u/Ringo)\
**Post date:** [June 5, 2002, 3:47pm UTC](https://boards.straightdope.com/t/sleeping-in-grogginess-why/112498/3 "2002-06-05T15:47:58Z")

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Sri Cecil:

[Why do you feel groggy after oversleeping?](http://www.straightdope.com/classics/a990205.html)