0:40:05 > 0:40:08# If you've got a question and you don't know where to go
0:40:08 > 0:40:11# Ask Nina for some help 'cos she's got a science show
0:40:11 > 0:40:15# She makes sense of our senses While helping all her fans
0:40:15 > 0:40:17# By doing her experiments With potions and with bangs!
0:40:17 > 0:40:19# Touch your tongue (tongue)
0:40:19 > 0:40:20# Fingers (fingers)
0:40:20 > 0:40:23# Eyes (eyes), ears (ears), nose (nose)
0:40:23 > 0:40:26# Nina and the neurons find out what you need to know - yeah!
0:40:26 > 0:40:29# Nina and the neurons find out what you need to know
0:40:30 > 0:40:32# Luke, he helps us with our eyes And Felix, with our touch
0:40:32 > 0:40:36# Ollie sniffs out smells and scents And Belle, she hears so much
0:40:36 > 0:40:38# Bud is Ollie's brother He helps us with our taste
0:40:38 > 0:40:41# They're Nina's little neurons And they're coming to your place
0:40:41 > 0:40:43# Touch your tongue (tongue)
0:40:43 > 0:40:45# Fingers (fingers)
0:40:45 > 0:40:48# Eyes (eyes), ears (ears), nose (nose)
0:40:48 > 0:40:51# Nina and the neurons find out what you need to know - yeah!
0:40:51 > 0:40:55# Nina and the neurons find out what you need to know - oh, yeah! #
0:40:57 > 0:40:58Oh! Oh, hi there!
0:40:58 > 0:41:02Oh, excuse me. I'm a wee bit tired today.
0:41:02 > 0:41:04I was woken up in the night,
0:41:04 > 0:41:08by noisy cats meowing outside my bedroom window.
0:41:08 > 0:41:09BEEPING
0:41:09 > 0:41:15I hear a beep, I see a flash, I wonder what they're going to ask?
0:41:15 > 0:41:18Hi, Nina!
0:41:18 > 0:41:19Hi, guys!
0:41:19 > 0:41:21We have a question for you.
0:41:21 > 0:41:23Why do we have to sleep?
0:41:23 > 0:41:27That's a great question! Why do we have to sleep?
0:41:27 > 0:41:30It's so important we sleep enough.
0:41:30 > 0:41:34Come to my lab and we'll do some experiments to investigate.
0:41:34 > 0:41:36See you soon, Nina. Bye.
0:41:36 > 0:41:37Bye.
0:41:37 > 0:41:41I need help to answer this, and I know just who to ask.
0:41:41 > 0:41:44OK, neurons, time to get to work!
0:41:44 > 0:41:47WHIZZING AND WHIRRING
0:41:48 > 0:41:50FUNKY MUSIC
0:42:01 > 0:42:03Neurons at the ready, Nina.
0:42:03 > 0:42:07OK. Today's question is, why do we have to sleep?
0:42:07 > 0:42:11Which neuron will be most useful in finding the answer?
0:42:11 > 0:42:13- Me!- Me!- Me!- Me!- Me!
0:42:13 > 0:42:16Will it be...fabulous Felix?
0:42:16 > 0:42:20I can help so very much, if you need the sense of touch.
0:42:20 > 0:42:22Will it be...beautiful Belle?
0:42:22 > 0:42:26I send messages to brain from ear. If there's sound I'll help you hear.
0:42:26 > 0:42:28Will it be...lovely Luke?
0:42:28 > 0:42:33Looking and seeing, day or night, I'll help with your sense of sight.
0:42:33 > 0:42:35Will it be...awesome Ollie?
0:42:35 > 0:42:37If it's pongy or whiffy but you can't tell,
0:42:37 > 0:42:39my messages help your sense of smell.
0:42:39 > 0:42:40Or will it be baby Bud?
0:42:40 > 0:42:46Sour, salty, bitter or sweet, I'm your taste buddy when you eat.
0:42:49 > 0:42:52- It's ALL the neurons!- Yippee!- Yes!
0:42:52 > 0:42:56Go, neurons! Go, neurons! Go, neurons!
0:42:56 > 0:42:59Go, neurons! Go, neurons! Go, neurons!
0:42:59 > 0:43:02All neurons hip-hop-happy to help, Nina.
0:43:02 > 0:43:05Today's question is, why do we have to sleep?
0:43:05 > 0:43:09As sleep is important for the whole of our brilliant bodies,
0:43:09 > 0:43:11I need all the neurons to help.
0:43:11 > 0:43:15I need to get the lab ready before the experimenters arrive.
0:43:16 > 0:43:20'Teagan likes tennis, Olim likes sour sweets,
0:43:20 > 0:43:24'Kirsty loves science, but they all want to know why we have to sleep.
0:43:24 > 0:43:29So today, Teagan, Olim and Kirsty become the experimenters!'
0:43:31 > 0:43:34- Hi, guys.- Hi, Nina.
0:43:34 > 0:43:37Welcome to my science lab. Come in.
0:43:37 > 0:43:40Now, you asked, "Why do we have to sleep?",
0:43:40 > 0:43:43which is a great question. Why do you want to know?
0:43:43 > 0:43:48Because my mum always tells me to go to bed early to get good sleep.
0:43:48 > 0:43:51And I want to know why.
0:43:51 > 0:43:54I know my body really enjoys a good night's sleep.
0:43:54 > 0:43:59Why do we sleep? We need to do some experiments to find out.
0:43:59 > 0:44:01Let's start by using our senses.
0:44:01 > 0:44:06Woo-hoo! A senses experiment. We're ready, Nina.
0:44:06 > 0:44:08So, who in your family sleeps?
0:44:08 > 0:44:13My mummy, my big brother, my daddy,
0:44:13 > 0:44:16and me, my little brother, and my pets.
0:44:16 > 0:44:21Yes, everyone, humans and animals, need to sleep some of the time.
0:44:21 > 0:44:25But some of us need more sleep than others.
0:44:25 > 0:44:29Here we have pictures of an adult, a child and a little baby.
0:44:29 > 0:44:31And they're all sleeping.
0:44:31 > 0:44:34Now, can you see the little zeds?
0:44:34 > 0:44:38Well, these show us how much sleep each of them need.
0:44:38 > 0:44:43So, who has the smallest amount of zeds next to them?
0:44:43 > 0:44:44The grown-up.
0:44:44 > 0:44:46And who has the most?
0:44:46 > 0:44:49- The top one.- And what's that? - A baby.
0:44:49 > 0:44:53Yes. Babies need to sleep a lot.
0:44:53 > 0:44:58That's because sleep is important in helping their brilliant bodies grow.
0:44:58 > 0:45:03Little babies have the most growing to do, so they need the most sleep.
0:45:03 > 0:45:06You guys still have lots of growing to do, too.
0:45:06 > 0:45:12You also need plenty of sleep, around 11 or 12 hours every night.
0:45:12 > 0:45:15Hey, that's about the same as me.
0:45:15 > 0:45:20This is Mr Bear. Do you want a wee cuddle? Yeah!
0:45:20 > 0:45:22He's a teddy, not a real bear.
0:45:22 > 0:45:26But did you know real bears are super-duper sleepers?
0:45:26 > 0:45:30In fact, bears actually sleep all winter,
0:45:30 > 0:45:33a great big, long sleep called hibernation.
0:45:33 > 0:45:37You would need a really comfy bed to sleep all winter, Nina.
0:45:37 > 0:45:40That's a very good point, Felix.
0:45:40 > 0:45:44I'd like you guys to choose things from the table,
0:45:44 > 0:45:47to make the comfiest, cosiest bed ever for Mr Bear's big sleep.
0:45:47 > 0:45:49Off you go!
0:45:49 > 0:45:51BALL SQUEAKS
0:45:51 > 0:45:54- What was that?- Look, a pillow!
0:45:54 > 0:45:58A pillow. A pillow's good.
0:46:02 > 0:46:04(Hard.)
0:46:04 > 0:46:06BALL SQUEAKS
0:46:06 > 0:46:12I'm not sure Mr Bear wants to sleep with a noisy, squeaky toy.
0:46:12 > 0:46:16Ah, a snuggly blanket and a comfy cushion. Bliss!
0:46:16 > 0:46:20Great work, guys. That bed looks SO cosy.
0:46:20 > 0:46:24How did you decide what would be the best things to make the bed?
0:46:24 > 0:46:27- We felt it.- You felt things.
0:46:27 > 0:46:34- Teagan, what did you put in the box? - I put the blanket and the pillow.
0:46:34 > 0:46:37- And what else is in with Mr Bear? - The little bear.
0:46:37 > 0:46:41- Why did you choose the little bear? - Because it's soft.
0:46:41 > 0:46:45Brilliant! So now Mr Bear has a quiet, comfy bed.
0:46:45 > 0:46:47You might want to dim the lights, Nina.
0:46:47 > 0:46:49Good thinking, Luke.
0:46:49 > 0:46:53Best not to have too much light in the room if you're sleeping.
0:46:54 > 0:46:58Hey, hey. So, now we know we all need to sleep,
0:46:58 > 0:47:04especially children and babies, because sleep helps them to grow.
0:47:04 > 0:47:10A quiet, darkened room, with a warm, soft bed, is best for sleeping in.
0:47:10 > 0:47:13To find out more about why we need to sleep,
0:47:13 > 0:47:16we need to go somewhere busy and exciting.
0:47:16 > 0:47:19Oh, just a second...
0:47:20 > 0:47:25(Sweet dreams, Mr Bear. Follow me, experimenters.)
0:47:29 > 0:47:32'Off we go, for another adventure.'
0:47:32 > 0:47:36Nina said it's somewhere busy and exciting.
0:47:36 > 0:47:40Maybe it's the airport? Eeeoowww...
0:47:40 > 0:47:43It looks busy, but I don't see any planes.
0:47:43 > 0:47:48No, it's not an airport, but I've a feeling it's going to be fun.
0:48:05 > 0:48:07- Hello, Mr Postman.- Hello, Nina.
0:48:07 > 0:48:11We're here to find out why sleep is important for our brain,
0:48:11 > 0:48:15which is the thing inside our head that controls our body.
0:48:15 > 0:48:18Do you see those envelopes Mr Postman was collecting?
0:48:18 > 0:48:21- Yes, Nina. - Well, those letters and cards
0:48:21 > 0:48:25are like the new bits of information our brain collects when we're awake.
0:48:25 > 0:48:30Every time we see, hear, smell, taste or feel something,
0:48:30 > 0:48:34our brain takes in the information from our sense neurons.
0:48:34 > 0:48:38That's us. We're Nina's sense neurons.
0:48:38 > 0:48:42When we sleep, our brain gets a rest from taking in all this information,
0:48:42 > 0:48:45but it still has a very important job to do.
0:48:45 > 0:48:48To find out more, we're going to follow Mr Postman!
0:49:04 > 0:49:06What is the postman doing?
0:49:06 > 0:49:10- Sorting out the letters into different boxes.- That's right.
0:49:10 > 0:49:12It's important none of the mail gets lost
0:49:12 > 0:49:16so Mr Postman is sorting everything into the right places.
0:49:16 > 0:49:19This is just like what our brain does when we sleep.
0:49:19 > 0:49:23It sorts through all the new information collected during the day
0:49:23 > 0:49:28and stores it away safely so we can remember it later.
0:49:28 > 0:49:31Scientists also believe that all this sorting out
0:49:31 > 0:49:33is why we sometimes dream when we sleep.
0:49:33 > 0:49:39I once dreamt that Ollie turned into a giant orange! Ha-ha-ha!
0:49:39 > 0:49:41Really, Bud?
0:49:41 > 0:49:45Our memories can get jumbled up when the brain sorts things out
0:49:45 > 0:49:48so dreams can be a mixture of things we remember from yesterday
0:49:48 > 0:49:51and things from ages ago.
0:49:51 > 0:49:54- Thanks for your help, Mr Postman. - No problem at all, Nina.
0:49:54 > 0:49:58We now know that sleep is very important for our brains,
0:49:58 > 0:50:01but why else do we need sleep?
0:50:01 > 0:50:04- Time to go back to the lab for one final experiment.- Yay!
0:50:04 > 0:50:06Let's go! Bye!
0:50:08 > 0:50:12This experiment should help explain what happens
0:50:12 > 0:50:14when our bodies get tired.
0:50:14 > 0:50:19OK, now, let's have a look at this little pig.
0:50:22 > 0:50:24PIG OINKS
0:50:24 > 0:50:27Now, does he seems sleepy to you?
0:50:27 > 0:50:29- No.- No?
0:50:29 > 0:50:34He is full of energy. Come back here, pig.
0:50:34 > 0:50:36If you switch on these other toys,
0:50:36 > 0:50:40I think you'll find they're all pretty lively, too.
0:50:40 > 0:50:41So, let's have a play!
0:51:00 > 0:51:03Oh, dear. Looks like there's a problem.
0:51:03 > 0:51:06Oh, what's happening to the toys?
0:51:06 > 0:51:09- They're slowing down. - They're broken.
0:51:09 > 0:51:14Actually, the toys are fine, but they're running low on power.
0:51:14 > 0:51:17Let's try charging the batteries and see what happens.
0:51:17 > 0:51:24The toy's batteries need recharged, a bit like our bodies needing sleep.
0:51:24 > 0:51:27We use up lots of energy all day,
0:51:27 > 0:51:30and then we sleep, to let our bodies rest
0:51:30 > 0:51:34and recover from all the activity.
0:51:34 > 0:51:38Let's see if they're back to being lively little toys.
0:51:40 > 0:51:41PIG OINKS
0:51:41 > 0:51:43And the pig!
0:51:44 > 0:51:45PUPPY BARKS
0:51:45 > 0:51:48Oh! The dog.
0:51:48 > 0:51:52Yes, the toys' batteries are definitely recharged.
0:51:56 > 0:52:00So, you asked, why do we have to sleep?
0:52:00 > 0:52:05I think we've answered it. Sleep is important for our body and brain.
0:52:05 > 0:52:10It gives our body time to recharge after a busy day
0:52:10 > 0:52:12and our brain time to sort out
0:52:12 > 0:52:17the new information taken in from our senses, so we can remember them.
0:52:17 > 0:52:19We all need sleep.
0:52:19 > 0:52:22But children and babies need more than adults
0:52:22 > 0:52:25as sleep is important in helping their brilliant bodies grow.
0:52:25 > 0:52:28I hope that's answered your question.
0:52:28 > 0:52:32- Thanks, Nina. Bye! - Bye!
0:52:34 > 0:52:38If you want to find out more about the science all around us,
0:52:38 > 0:52:42go to the Nina section on the CBeebies website. Have fun!
0:52:42 > 0:52:44- # Hearts beating - # Lungs breathing
0:52:44 > 0:52:47- # Fingers feeling - # Mouths eating
0:52:47 > 0:52:49# And don't forget your brain!
0:52:49 > 0:52:51# Brilliant bodies, brilliant bodies
0:52:51 > 0:52:54# Inside and ou-ou-out
0:52:54 > 0:52:59# Brilliant bodies, brilliant bodies Come on, let's find out about
0:52:59 > 0:53:05# A handy hand, bendy knees Stretchy backs, noses that sneeze
0:53:05 > 0:53:07# We all have brilliant bodies
0:53:07 > 0:53:10# Brilliant bodies!
0:53:10 > 0:53:14# Every part has a job to do Even scabs and ear wax, too
0:53:14 > 0:53:17# We all have brilliant bodies
0:53:17 > 0:53:19# Brilliant bodies!
0:53:19 > 0:53:24# Brilliant bodies, brilliant bodies Lashes to protect our eyes
0:53:24 > 0:53:27# Brilliant bodies, brilliant bodies
0:53:27 > 0:53:31# And don't forget to exercise. #
0:53:31 > 0:53:33I really enjoyed myself today,
0:53:33 > 0:53:37finding out that children need lots of sleep to help them grow.
0:53:37 > 0:53:39It's been a marvellous day.
0:53:39 > 0:53:44The experimenters made such a warm, comfy bed for Mr Bear.
0:53:44 > 0:53:48Ah, it's been such a great day, man.
0:53:48 > 0:53:52Seeing all those letters getting sorted so they don't get lost.
0:53:52 > 0:53:54I've had a fabby day.
0:53:54 > 0:53:59The toys had lots of energy after they were recharged.
0:53:59 > 0:54:03Remember, everyone's body is different but they're all brilliant.
0:54:03 > 0:54:05See you again soon. Bye.
0:54:05 > 0:54:07Bye!
0:54:08 > 0:54:10Subtitles by Bed Bee Media Ltd
0:54:10 > 0:54:13E-mail subtitling@bbc.co.uk