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Why do we feel sleepy, tired, and feel like we need to sleep more when we wake up? (Like, is there a special chemical in the brain that causes that?).

Are there any ways to wake up without feeling such things?

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    $\begingroup$ It is not tired by sleeping excessively, the question was why do we feel sleepy when we just wake up from being asleep. $\endgroup$ – C. Shockley Aug 15 '16 at 17:29
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    $\begingroup$ Let say you are hungry and I stop you in the middle of your lunch. With high probability... you will be still hungry %)) $\endgroup$ – Ilan Aug 15 '16 at 20:29
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    $\begingroup$ I don't know if anyone else experiences this, but for me I always wake up six hours after falling asleep (and that's usually as soon as my head touches the pillow). At that precise moment when I wake up, I'm wide awake. Any sooner I feel sleepy and any later I feel groggy. $\endgroup$ – FoldedChromatin Aug 16 '16 at 6:38
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    $\begingroup$ It is true I feel more sleepy in a vacation morning when I'd slept early, (with no factor of anxiety or stress) and normally rise on morning; than the end of an extremely busy, anxious, unslept night. $\endgroup$ – Always Confused Aug 28 '16 at 11:24
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    $\begingroup$ Probably it is not solely due to lack of sleep $\endgroup$ – Always Confused Aug 28 '16 at 11:28
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Yes, what you mentioned in your question is a common problem for many of us. I did a Google search and here's what I found:

Reasons:

https://www.caring.com/articles/surprising-reasons-you-wake-up-tired

http://valleysleepcenter.com/why-do-i-wake-up-tired-5-reasons-you-can-get-enough-sleep-and-still-be-sleepy/

The site webMD offers a nice guideline:

http://www.webmd.com/balance/features/your-guide-to-never-feeling-tired-again?page=3

Also, there is a hormone, melatonin, secreted by the pineal gland in brain, which regulates the 24 hour sleep wake cycle.

http://www.webmd.com/sleep-disorders/tc/melatonin-overview

https://sleepfoundation.org/sleep-topics/melatonin-and-sleep

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    $\begingroup$ Just mentioning references is not enough as links may be broken or may expire. You should add a summary or the main point from the reference. $\endgroup$ – another 'Homo sapien' Aug 16 '16 at 10:49

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