Researchers Say 7 Hours of Sleep Needed for Optimal Energy

While the number varies among individuals, studies show cognitive performance peaks at seven hour.
3:38 | 07/22/14

Coming up in the next {{countdown}} {{countdownlbl}}

Coming up next:



Skip to this video now

Now Playing:


Related Extras
Related Videos
Video Transcript
Transcript for Researchers Say 7 Hours of Sleep Needed for Optimal Energy
I have to confess. I was diving into that latest viral craze, the fakecation. Faca. People have been crafting photos as close as they can get to some travel hot spots so I got to work this morning. Let's take a look at some of the pictures that we have because I think there's even one of you guys. You guys might have taken a little -- oh, yeah. That was so fun. Wasn't that fun? We're a little stiff. But you know what's funny, I was actually in San Francisco on a shoot last week and I never once took -- Did you see us. I never once took one at the golden gate. Gio doesn't get vacation. Always working hard. Yeah, but you do that and see the postings and you're wondering, are they real? So they take their fingers and make it look like they are legs and looks like they're at the beach. It's really funny. They showed how they did it. Let's see if we can see one. Of course, they won't put it on. Ah. What a great idea and go like this, see, got to -- That looks like your knees. Your knees on the beach. It's really funny. You have a lot of time. That's true. And next up on the "Heat index." Former "Full house" star and "Dancing with the stars" finalist Candace Cameron Bure speaking out defending her decision to do a low-calorie cleanse and ABC's Abbie Boudreau has her story. ? Reporter: Actress and "Dancing with the stars" sweetheart Candace Cameron Bure jumping on the detox diet bandwagon and getting backlash from fans when she posted a message to her Facebook page saying, after a very indulgent week in napa, I'm excited to kick off my five-day cleanse in it was a detoxifying cleanse and the comments starting coming in saying why are you doing a cleanse? You're too thin. This is so unhealthy. Reporter: The former "Full house" actress and author of "Balancing it all" has been open about her past struggles with eating disorders. It's not a secret that I dealt with bulimia but I've been healthy for more than ten years though to bring that up and saying you're doing a cleanse because maybe you're going back on that track is so discouraging for people to say. Reporter: Cameron Bure who finished third on last year's "Dancing with the stars" and took to Facebook yet again this time explaining why she's sticking to her low-calorie cleanse saying "Since being off "Dancing with the stars" my body has struggled to find its balance after having danced up to eight hours a day and eating so clean. It's been about two months since "Dancing with the stars" and my body has just not regulated itself. I haven't felt healthy and I know that a cleanse for me will just get me right back on track. Reporter: I was with Candace on the fifth and final day of her paleta cleanse. You made it. I have two shakes. 1200 calorie per day program with protein shakes in the morning and afternoon and veggies for dinner. The 38-year-old mother of three hoping her message is clearer. I'm secure with who I am and what my body shape is. Reporter: For people who say cleanses are not necessary, number one and, number two, not really that healthy, what is your comment? I like them. I see the health benefits from them but if it's not your thing, don't do it. Reporter: For "Good morning America," Abbie Boudreau, ABC news, Los Angeles. It's not your thing. That's right. But if it works for you, I guess. There's a lot of -- Controversy. We'll leave it at that. But it works for her and she looks great if answer she was a great dancer. Yes, she was.

This transcript has been automatically generated and may not be 100% accurate.

{"id":24664175,"title":"Researchers Say 7 Hours of Sleep Needed for Optimal Energy","duration":"3:38","description":"While the number varies among individuals, studies show cognitive performance peaks at seven hour.","url":"/GMA/video/researchers-hours-sleep-needed-optimal-energy-24664175","section":"GMA","mediaType":"default"}