0:00:05 > 0:00:08# If you've got a question and you don't know where to go
0:00:08 > 0:00:12# Ask Nina for some help cos she's got a science show
0:00:12 > 0:00:15# She makes sense of her senses while helping all her fans
0:00:15 > 0:00:17# By doing her experiments with potions and with bangs
0:00:17 > 0:00:19- # Touch your tongue- Tongue!
0:00:19 > 0:00:20- # Fingers- Fingers!
0:00:20 > 0:00:23- # Eyes.- Eyes! - Ears.- Ears!- Nose.- Nose!
0:00:23 > 0:00:27# Nina and the Neurons find out what you need to know
0:00:27 > 0:00:30# Nina and the Neurons find out what you need to know
0:00:30 > 0:00:33# Luke, he helps us with our eyes and Felix with our touch
0:00:33 > 0:00:36# Ollie sniffs out smells and scents and Belle, she hears so much
0:00:36 > 0:00:38# Bud is Ollie's brother he helps us with our taste
0:00:38 > 0:00:41# They're Nina's little neurons And they're coming to your place!
0:00:41 > 0:00:43- # Touch your tongue- Tongue!
0:00:43 > 0:00:44- # Fingers- Fingers!
0:00:44 > 0:00:48- # Eyes.- Eyes! - Ears.- Ears!- Nose.- Nose!
0:00:48 > 0:00:51# Nina and the Neurons find out what you need to know
0:00:51 > 0:00:53# Nina and the Neurons find out what you need to know
0:00:53 > 0:00:54# Oh, yeah! #
0:00:57 > 0:01:00Aah... Aah... Atchoo!
0:01:00 > 0:01:02Oh! Ho-ho-ho! Oh, hello!
0:01:02 > 0:01:06I'm just giving my lovely crystal collection a dust.
0:01:06 > 0:01:10It's been a while since I've done it, so the dust is making me sneeze!
0:01:10 > 0:01:12BEEPING
0:01:12 > 0:01:16I hear a beep, I see a flash, I wonder what they're going to ask?
0:01:22 > 0:01:24- Hi, Nina!- Hi, guys!
0:01:24 > 0:01:29- We've got a question for you.- Why do we get sleepy dust in our eyes?
0:01:29 > 0:01:31What a good question!
0:01:31 > 0:01:33Why do we get sleepy dust in our eyes?
0:01:33 > 0:01:36Some people call it "sleep in our eyes".
0:01:36 > 0:01:40It's those little hard bits that we sometimes get in the corner.
0:01:40 > 0:01:45Come down to the lab. We'll do some experiments to investigate.
0:01:45 > 0:01:48BOTH: See you soon, Nina! Bye!
0:01:48 > 0:01:49Bye!
0:01:49 > 0:01:54I'm going to need some help to answer this. I know just who to ask.
0:01:54 > 0:01:56OK, Neurons, time to get to work.
0:02:13 > 0:02:15ALL: Neurons at the ready, Nina!
0:02:15 > 0:02:20OK, today's question is, why do we get sleepy dust in our eyes?
0:02:20 > 0:02:24Which Neuron will be most useful helping us find the answer?
0:02:24 > 0:02:27ALL: Me, me, me!
0:02:27 > 0:02:30Will it be fabulous Felix?
0:02:30 > 0:02:34I can help so very much, if you need the sense of touch.
0:02:34 > 0:02:36Will it be beautiful Belle?
0:02:36 > 0:02:38I send messages to brain from ear,
0:02:38 > 0:02:41if there's a sound, I'll help you hear.
0:02:41 > 0:02:42Will it be lovely Luke?
0:02:42 > 0:02:45Looking and seeing, day or night,
0:02:45 > 0:02:47I'll help you with your sense of sight.
0:02:47 > 0:02:49Will it be awesome Ollie?
0:02:49 > 0:02:52If it's pongy or whiffy, but you can't tell,
0:02:52 > 0:02:56- my messages help your sense of smell.- Or will it be baby Bud?
0:02:56 > 0:03:00Sour, salty, bitter or sweet, I'm your taste buddy, whenever you eat.
0:03:00 > 0:03:03BEEPING
0:03:05 > 0:03:06It's Luke!
0:03:06 > 0:03:08CHEERING
0:03:08 > 0:03:10OTHER NEURONS: Go, Luke! Go, Luke!
0:03:10 > 0:03:12Go, Luke! Go, Luke!
0:03:12 > 0:03:14Go, Luke! Go, Luke!
0:03:14 > 0:03:18Cool, Nina! I'll be looking out to help ya!
0:03:18 > 0:03:23Today's question is, why do we get sleepy dust in our eyes?
0:03:23 > 0:03:26Because sleepy dust is something we get in our eyes,
0:03:26 > 0:03:30Luke, our seeing Neuron, will be helping us today.
0:03:30 > 0:03:32But Neurons, I may need help from all of you.
0:03:32 > 0:03:37Right, I need to get the lab ready before the experimenters arrive.
0:03:40 > 0:03:44Daniel likes pizza. His twin brother Luke loves swimming.
0:03:44 > 0:03:47But both want to know about sleepy dust, so today,
0:03:47 > 0:03:53for one day only, Daniel and Luke become The Experimenters!
0:03:55 > 0:03:56Hi, guys!
0:03:56 > 0:03:58BOTH: Hi, Nina!
0:03:58 > 0:04:01Welcome to my science lab. It's lovely to see you both.
0:04:01 > 0:04:05Your question is, why do we get sleepy dust in our eyes?
0:04:05 > 0:04:09- Why do you want to know?- I woke up this morning and had it in my eyes.
0:04:09 > 0:04:11Where does it come from?
0:04:11 > 0:04:14That's what we're going to try and find out,
0:04:14 > 0:04:17because I get sleepy dust in my eyes, too,
0:04:17 > 0:04:21and it seems to be when I wake up in the morning. Oh, let's check.
0:04:21 > 0:04:25Let's see if anyone has got any at the moment. Have a feel.
0:04:27 > 0:04:31No, there's nothing there, Nina. Your eyes are sleepy dust-free!
0:04:31 > 0:04:33You're right, Felix.
0:04:33 > 0:04:36I can't feel any sleepy dust. What about you guys?
0:04:36 > 0:04:38BOTH: No, Nina!
0:04:38 > 0:04:42So, we only get sleepy dust when we wake up after a big sleep.
0:04:42 > 0:04:45We can tell it's there because we can feel it.
0:04:45 > 0:04:49I think we need to investigate, to find out more.
0:04:49 > 0:04:51Firstly, we're going to use our senses.
0:04:51 > 0:04:56ALL: Whoop-whoo! A senses experiment! We're ready, Nina!
0:04:56 > 0:05:02OK, so here we have some jam, some mashed potato and some sand.
0:05:02 > 0:05:05Let's see if any of these feel like sleepy dust.
0:05:05 > 0:05:08Let's get our fingers in!
0:05:10 > 0:05:12Does it feel like sleepy dust?
0:05:12 > 0:05:13- No.- No?
0:05:13 > 0:05:15It's gooey, isn't it?
0:05:18 > 0:05:23- What does the mashed potato feel like?- Slippery and squidgy.
0:05:23 > 0:05:27- What does the sand feel like? - Quite hard.
0:05:27 > 0:05:29It's crunchy.
0:05:29 > 0:05:33- Do you think this feels like sleepy dust?- Yes.- Yeah.
0:05:33 > 0:05:37Yes, the little hard grains of sand feel a bit like sleepy dust.
0:05:37 > 0:05:39But how does it get in our eyes?
0:05:39 > 0:05:43I know another experiment. It might help us find out more.
0:05:46 > 0:05:50- What do you normally do with your eyes?- See.- Blink.- Yeah.
0:05:50 > 0:05:55But there's something else you do with your eyes when you're sad.
0:05:55 > 0:05:56NINA PRETENDS TO CRY
0:05:56 > 0:05:57Cry!
0:05:57 > 0:05:59Yes, you cry!
0:05:59 > 0:06:02And when you cry, tears come from your eyes.
0:06:02 > 0:06:04What do tears look like?
0:06:04 > 0:06:05- Water?- Yes.
0:06:05 > 0:06:08Are these beakers filled with water?
0:06:08 > 0:06:09BOTH: Yes!
0:06:09 > 0:06:13Some are water and some are a clear chemical,
0:06:13 > 0:06:16so we need to put our safety goggles on.
0:06:16 > 0:06:19I'm also wearing protective gloves, as I'll be handling the chemicals.
0:06:19 > 0:06:21Nina's specially trained to do this.
0:06:21 > 0:06:25You should never try mixing things yourself at home.
0:06:25 > 0:06:26OK.
0:06:29 > 0:06:30Hoo-hoo!
0:06:30 > 0:06:32Can you see that?
0:06:33 > 0:06:36Something very strange is happening.
0:06:36 > 0:06:38It's got all thick.
0:06:38 > 0:06:39Thick and gloopy.
0:06:39 > 0:06:41That's amazing.
0:06:41 > 0:06:45Oh. OK, next up...
0:06:49 > 0:06:50BOYS: Wow!
0:06:50 > 0:06:51That's brilliant.
0:06:51 > 0:06:54It's changing colour.
0:06:54 > 0:06:57That's definitely not like any water I've seen, Nina.
0:06:57 > 0:07:00That's because it's not water, Luke.
0:07:00 > 0:07:02This has shown that
0:07:02 > 0:07:05just because some things are clear and look like water,
0:07:05 > 0:07:08doesn't mean they are. Just like tears.
0:07:08 > 0:07:10They look like water,
0:07:10 > 0:07:13but they have special salts in them, to help keep our eyes clean.
0:07:13 > 0:07:16To find out even more about sleepy dust,
0:07:16 > 0:07:19we need to find out lots more about tears.
0:07:19 > 0:07:23Chop an onion! Then there'll be lots of tears.
0:07:23 > 0:07:24We don't need to do that, Bud.
0:07:24 > 0:07:28We just have to find somewhere really, really muddy!
0:07:28 > 0:07:30Let's go! Goggles off!
0:07:37 > 0:07:40Hmm... Where do you think we're going today?
0:07:40 > 0:07:46- Nina said we were going somewhere muddy.- And muddy means messy!
0:07:46 > 0:07:49Hey, guys, looks like we're here!
0:07:51 > 0:07:56- Here we are. Have you guessed why we're here yet?- No, Nina!
0:07:56 > 0:07:59Why don't we take a drive to find out? Woo-hoo!
0:07:59 > 0:08:02Let's get in. Don't forget to buckle up.
0:08:27 > 0:08:30It's a bit noisy!
0:08:30 > 0:08:33And a bit, ooh, b-b-bouncy.
0:08:33 > 0:08:37LUKE: And very messy, too. Look at that windscreen.
0:08:42 > 0:08:47Oh, it's getting hard to see. There's so much mud.
0:08:47 > 0:08:50- What could we use to clean it off?- Water?
0:08:50 > 0:08:51Great idea.
0:08:54 > 0:08:57We just squirt some water and put the wipers on.
0:09:03 > 0:09:08Well, the water an wipers are certainly doing the trick.
0:09:08 > 0:09:12- That was brilliant, wasn't it? - BOTH: Yes!
0:09:12 > 0:09:15And our eyes are a bit like a windscreen.
0:09:15 > 0:09:18There are lots of little things that float in the air,
0:09:18 > 0:09:21that can get into our eyes. Like dust.
0:09:21 > 0:09:24All day, our eyes make tears and when we blink,
0:09:24 > 0:09:27we wipe the tears and wash the dirt away,
0:09:27 > 0:09:30just like the windscreen wipers.
0:09:30 > 0:09:31But what do tears
0:09:31 > 0:09:33have to do with sleepy dust?
0:09:33 > 0:09:35We don't know, Nina.
0:09:35 > 0:09:39Let's go back to the lab to do a final experiment.
0:09:39 > 0:09:42Maybe that will help us see more clearly! Follow me!
0:09:44 > 0:09:48So, your question was, why do we get sleepy dust in our eyes?
0:09:48 > 0:09:52So far, we've discovered that, although tears are clear,
0:09:52 > 0:09:56just like water, they have special salts which clean our eyes.
0:09:56 > 0:10:00We've also learned that our eyes make tears all day long,
0:10:00 > 0:10:03which wipe when we blink and keep them clean.
0:10:03 > 0:10:06Now we need to find out where sleepy dust comes from.
0:10:06 > 0:10:08Let's get experimenting!
0:10:08 > 0:10:10BOTH: Yeah!
0:10:10 > 0:10:14For this experiment, we'll make something a bit like sleepy dust.
0:10:14 > 0:10:18We're going to use another type of salt, called Epsom salts.
0:10:18 > 0:10:22Let's take our Epsom salts and pour them into the warm water.
0:10:22 > 0:10:27And using our stirrer, give it a good stir.
0:10:30 > 0:10:32Very good.
0:10:32 > 0:10:34Let's take our droppers
0:10:34 > 0:10:39and put a little bit of this liquid onto our black paper, here.
0:10:42 > 0:10:46OK, let's use our fingers and spread the liquid out.
0:10:47 > 0:10:51Well done, guys. Now, something amazing will happen.
0:10:53 > 0:10:58- Can you see what's happening?- It's turning into something.- It's white.
0:10:58 > 0:11:00Yeah, it looks a bit white.
0:11:00 > 0:11:03It looks a bit like snowflakes, Nina.
0:11:03 > 0:11:07Oh, it does a bit, Luke. But these are actually called crystals.
0:11:07 > 0:11:11Let's use our magnifying glass and have a closer look.
0:11:11 > 0:11:13- Oh...- Oh.
0:11:13 > 0:11:17They look like little sparkles.
0:11:17 > 0:11:21- They look like twinkly stars.- Yeah.
0:11:21 > 0:11:27These crystals here, these had longer to form and dry out.
0:11:27 > 0:11:32I've scraped some of the crystals off. Now, what do they feel like?
0:11:32 > 0:11:34Oh, goody, my turn!
0:11:34 > 0:11:36Crunchy.
0:11:39 > 0:11:42- Spiky.- Yeah, it's quite crunchy and crispy,
0:11:42 > 0:11:45just like sleepy dust.
0:11:49 > 0:11:53So, your question was, why do we get sleepy dust in our eyes.
0:11:53 > 0:11:57I think we've answered it. We discovered that our eyes
0:11:57 > 0:12:01make tears all the time. As we blink, the tears wipe over our eyes
0:12:01 > 0:12:05and this keeps our eyes clean during the day.
0:12:05 > 0:12:07When we're sleeping, we don't blink.
0:12:07 > 0:12:12So the tears gather in the corners, where they dry out and leave behind
0:12:12 > 0:12:15the special cleaning salts that are in our tears.
0:12:15 > 0:12:20That's why, sometimes, there's sleepy dust, or sleep, in our eyes
0:12:20 > 0:12:23when we wake up. I hope that's answered your question.
0:12:23 > 0:12:25Thanks, Nina, bye!
0:12:25 > 0:12:27You're welcome. Bye.
0:12:31 > 0:12:35If you want to know more about the science that's all around us,
0:12:35 > 0:12:38go to the Nina section on the CBeebies website. Have fun!
0:12:41 > 0:12:44Lab coat on, Nina?
0:12:44 > 0:12:45Lab coat on, Ollie.
0:12:45 > 0:12:47Safety gloves on, Nina?
0:12:47 > 0:12:49Safety gloves on, Felix.
0:12:49 > 0:12:52And don't forget your goggles, Nina.
0:12:52 > 0:12:55Goggles are on, Luke. I think we're ready.
0:12:57 > 0:12:59# We do experiments in the lab
0:12:59 > 0:13:02# Shoo-be-dooby in the lab
0:13:02 > 0:13:05# Bubbling experiments in the lab
0:13:05 > 0:13:08- # In the lab! - Go, Nina, in the lab
0:13:08 > 0:13:11# Fizzing and popping Steam and smoke
0:13:11 > 0:13:14# We need protection Don't we, folks?
0:13:14 > 0:13:19# We always put our safety first
0:13:21 > 0:13:23# We do experiments in the lab
0:13:23 > 0:13:25- # In the lab!- Go, Nina...! #
0:13:25 > 0:13:30It's been a marvellous day. The sand really did feel like sleepy dust.
0:13:30 > 0:13:33I really enjoyed myself today.
0:13:33 > 0:13:37The smells coming from Nina's beakers were really whiffy.
0:13:37 > 0:13:42I had a fabby day, especially when the windscreen got really muddy
0:13:42 > 0:13:46and messy, and Nina had to clean it with the wipers.
0:13:46 > 0:13:49Oh, it's been such a great day, man.
0:13:49 > 0:13:52Those crystals looked amazing.
0:13:52 > 0:13:56Our day's been bursting with sensational experiments.
0:13:56 > 0:14:01- I hope you've enjoyed it. See you soon. Bye!- Bye!
0:14:01 > 0:14:04E-mail subtitling@bbc.co.uk