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Caffeine More Likely To Disrupt Sleep In Morning People, Study Finds

Caffeine Sleep Morning People

Posted: 03/08/2012 11:10 am EST

Are you a morning person?

Then that cup of coffee during the day is more likely to mess with your sleep, according to a new study first reported by MyHealthNewsDaily.

Researchers from Stanford University examined the caffeine consumption and sleep patterns of 50 college students (they wore wrist monitors so that the researchers would know when they were experiencing a period of wakefulness during sleep), MyHealthNewsDaily reported.

The researchers found that after consuming caffeine during the day, the late sleepers were less likely to have disrupted sleep than the people who woke up early, according to MyHealthNewsDaily.

According to ABC News, a recent round-up of the research on caffeine in The Cochrane Library showed that the stimulant largely helps to improve memory and performance, and can even help people concentrate better.

However, Dr. Donna Arand, clinical director of the Kettering Sleep Disorder Center, told ABC News that there is evidence that caffeine can affect how long it takes you to fall asleep.

Recently, we reported on a new smartphone app called "Caffeine Zone," which can help people figure out when they should stop drinking their caffeine-source-of-choice in order to get a good night's rest.

"Many people don't understand how caffeine levels in their bloodstream go up and how they go down," Frank Ritter, a professor at Penn State University, said in a statement. "It's important to understand the effect that caffeine can have at these various levels."

For more effects of caffeine on our bodies, make sure to read our piece here. And click through the slideshow to see how much caffeine is in your favorite drinks:

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  • Brewed Coffee

    <a href="http://www.cspinet.org/new/cafchart.htm" target="_hplink">100 to 200mg per 8 ounces</a>, according to the Center for Science in the Public Interest (CSPI)

  • Instant Coffee

    <a href="http://www.cspinet.org/new/cafchart.htm" target="_hplink">27 to 173mg per 8 ounces</a>, according to CSPI

  • Coke

    <a href="http://productnutrition.thecoca-colacompany.com/articles/caffeine" target="_hplink">23mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Coca-Cola-Classic-12-Ounce-Cans/dp/B004JXBHQK/ref=sr_1_1?s=grocery&ie=UTF8&qid=1327360476&sr=1-1" target="_hplink">Amazon.com</a></em>

  • Pepsi

    <a href="http://www.pepsicobeveragefacts.com/caffeine.php" target="_hplink">25mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Pepsi-Cola-12-Ounce-Cans-Pack/dp/B004JX9FDM/ref=sr_1_1?s=grocery&ie=UTF8&qid=1327360867&sr=1-1" target="_hplink">Amazon.com</a></em>

  • Diet Coke

    <a href="http://productnutrition.thecoca-colacompany.com/articles/caffeine" target="_hplink">31mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Diet-Coke-12-Ounce-Cans-Pack/dp/B004JXDCC2/ref=sr_1_2?s=grocery&ie=UTF8&qid=1327360540&sr=1-2" target="_hplink">Amazon.com</a></em>

  • Diet Pepsi

    <a href="http://www.pepsicobeveragefacts.com/caffeine.php" target="_hplink">24mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Diet-Pepsi-12-Ounce-Cans-Pack/dp/B004JXDD6W/ref=sr_1_5?s=grocery&ie=UTF8&qid=1327360797&sr=1-5" target="_hplink">Amazon.com</a></em>

  • Mountain Dew

    <a href="http://www.pepsicobeveragefacts.com/caffeine.php" target="_hplink">36mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Mountain-Dew-12-Ounce-Cans-Pack/dp/B004JX7O6W/ref=sr_1_1?s=grocery&ie=UTF8&qid=1327360735&sr=1-1" target="_hplink">Amazon.com</a></em>

  • Coke Zero

    <a href="http://productnutrition.thecoca-colacompany.com/articles/caffeine" target="_hplink">23mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Coca-Cola-Coke-Zero-Cans-12-pk/dp/B003NTFRMG/ref=sr_1_6?s=grocery&ie=UTF8&qid=1327360605&sr=1-6" target="_hplink">Amazon.com</a></em>

  • Dr. Pepper

    <a href="http://www.drpepper.com/text/faq/#q" target="_hplink">28mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Dr-Pepper-12-Ounce-Cans-Pack/dp/B004JX5NGA/ref=sr_1_1?s=grocery&ie=UTF8&qid=1327361288&sr=1-1" target="_hplink">Amazon.com</a></em>

  • Diet Dr. Pepper

    <a href="http://www.drpepper.com/text/faq/#q" target="_hplink">28mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Diet-Dr-Pepper-12-Ounce-Cans/dp/B004K9C4ZG/ref=sr_1_6?s=grocery&ie=UTF8&qid=1327361329&sr=1-6" target="_hplink">Amazon.com</a></em>

  • Tea

    <a href="http://www.cspinet.org/new/cafchart.htm" target="_hplink">40 to 120mg per 8 ounces</a>, according to CSPI

  • Espresso

    <a href="http://www.cspinet.org/new/cafchart.htm" target="_hplink">30 to 90mg per 1 ounce</a>, according to CSPI

  • 5-Hour Energy

    <a href="http://www.5hourenergy.com/ingredients.asp#Caffeine" target="_hplink">"Comparable to a cup of premium coffee,"</a> according to 5hourenergy.com, which would be <a href="http://www.cspinet.org/new/cafchart.htm" target="_hplink">about 160mg</a>, according to CSPI. <em>Photo from <a href="http://www.amazon.com/Hour-Energy-Pomegranate-1-93-Ounce-Bottles/dp/B003QNLTN0/ref=sr_1_5?ie=UTF8&qid=1327369641&sr=8-5" target="_hplink">Amazon.com</a></em>

  • Monster Energy Drink

    <a href="http://www.cspinet.org/new/cafchart.htm" target="_hplink">160mg per 16 ounces</a>, according to CSPI <em>Photo from <a href="http://www.amazon.com/Monster-Energy-Drink-16-Ounce-Cans/dp/B001A33FZ8/ref=sr_1_1?s=hpc&ie=UTF8&qid=1327369751&sr=1-1" target="_hplink">Amazon.com</a></em>

  • Red Bull

    <a href="http://www.redbull.com/cs/Satellite/en_INT/red-bull-energy-drink/001242937921959?pcs_c=PCS_Product&pcs_cid=1242937842064&pcs_pvt=faqs" target="_hplink">80 mg per 250ml can</a> <em>Photo from <a href="http://www.amazon.com/Red-Bull-Energy-8-4-Ounce-4-Count/dp/B000MTST70/ref=sr_1_1?s=grocery&ie=UTF8&qid=1327361150&sr=1-1" target="_hplink">Amazon.com</a></em>

  • JOLT

    <a href="http://www.joltenergy.com/faqs.html" target="_hplink">140mg per 12 ounces</a> <em>Photo from <a href="http://www.amazon.com/Jolt-Cola-12ct/dp/B0016889E4/ref=sr_1_9?s=grocery&ie=UTF8&qid=1327361224&sr=1-9" target="_hplink">Amazon.com</a></em>

  • Amp Energy Drink

    <a href="http://www.pepsicobeveragefacts.com/caffeine.php" target="_hplink">71mg per 8 ounces</a>, 143mg per can <em>Photo from <a href="http://www.amazon.com/AMP-ENERGY-12-PK-CANS/dp/B0048E44RY/ref=sr_1_1?s=grocery&ie=UTF8&qid=1327360689&sr=1-1" target="_hplink">Amazon.com</a></em>

  • Lipton Brisk Teas

    <a href="http://www.pepsicobeveragefacts.com/caffeine.php" target="_hplink">3 to 7mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Lipton-Brisk-Lemon-Iced-Tea/dp/B0029XA7QS/ref=sr_1_2?s=grocery&ie=UTF8&qid=1327360996&sr=1-2" target="_hplink">Amazon.com</a></em>

  • Starbucks DoubleShot Coffee Drink

    <a href="http://www.pepsicobeveragefacts.com/caffeine.php" target="_hplink">160mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Starbucks-Doubleshot-Energy-Coffee-Drink/dp/B002U56LE2/ref=sr_1_2?s=grocery&ie=UTF8&qid=1327360930&sr=1-2" target="_hplink">Amazon.com</a></em>

  • Snapple Teas

    <a href="http://www.drpeppersnapplegroup.com/files/NutritionalInfo.pdf" target="_hplink">21 to 31mg per 8 ounces</a> <em>Photo from <a href="http://www.amazon.com/Snapple-Ice-Tea-Natural-Flavor/dp/B0012QD8MS/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1327369986&sr=1-2-catcorr" target="_hplink">Amazon.com</a></em>

  • Decaf Coffee

    <a href="http://www.cspinet.org/new/cafchart.htm" target="_hplink">3 to 12mg per 8 ounces</a>, according to CSPI

  • Hot Chocolate

    <a href="http://www.cspinet.org/new/cafchart.htm" target="_hplink">3 to 13mg per 8 ounces</a>, according to CSPI

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