0:00:03 > 0:00:06BELL RINGS MAN CLEARS THROAT
0:00:06 > 0:00:10Agh! I must be dreaming, you're actually here early.
0:00:10 > 0:00:12Sir, yes, sir. All present and accounted for.
0:00:12 > 0:00:14Eh? Erm, not quite.
0:00:14 > 0:00:15Where's Colin?
0:00:15 > 0:00:18HE SINGS IN OPERATIC VOICE
0:00:22 > 0:00:24Colin! Colin, Colin!
0:00:24 > 0:00:26Hey, Colin, Colin, Colin! Wake up!
0:00:26 > 0:00:30- Wake up, we're on in five.- Oh, crumpets. Must have fallen asleep.
0:00:30 > 0:00:32Positions, everyone!
0:00:32 > 0:00:35This is Brain Freeze.
0:00:35 > 0:00:36With Dr Knowles...
0:00:37 > 0:00:39..Professor McCork...
0:00:40 > 0:00:43..and Colin the floor manager.
0:00:45 > 0:00:47Stand by!
0:00:54 > 0:00:57- Hi, folks, and welcome to Brain Freeze.- It's time to reveal...
0:00:57 > 0:01:02- Today's Big Question! - Today we're asking, why do we dream?
0:01:02 > 0:01:05Do you know something? I don't think I've ever had a dream myself.
0:01:05 > 0:01:09That's impossible, Professor. Everybody dreams every night.
0:01:09 > 0:01:10For about two hours,
0:01:10 > 0:01:13which adds up to about six years of our lives spent dreaming.
0:01:13 > 0:01:14And how do you know that?
0:01:14 > 0:01:17By studying people's brainwaves while they sleep.
0:01:17 > 0:01:19There are five stages of sleep.
0:01:19 > 0:01:21This is stage one, when you're dropping off.
0:01:21 > 0:01:25Then as you move into stages two, three and stage four...
0:01:25 > 0:01:27the waves get bigger and slower.
0:01:27 > 0:01:32- But what's this?- Agh! My body's asleep but my brain is awake.
0:01:32 > 0:01:33What's going on?
0:01:33 > 0:01:37Ah, he's entered the stage known as REM sleep, or rapid eye movement.
0:01:37 > 0:01:40We know that most dreams occur during this stage. Unless you wake up
0:01:40 > 0:01:45during or soon after REM, you're unlikely to remember any dreams.
0:01:45 > 0:01:49Agh! Killer ducky! Cut to commercial, cut to commercial!
0:01:51 > 0:01:54BELL RINGS
0:01:54 > 0:01:58# La-la, la-la, la-la, la-la!
0:01:58 > 0:02:01# La-la, la-la, la-la, la-la! #
0:02:01 > 0:02:04Oh, maybe don't give up the day job just yet, Colin.
0:02:04 > 0:02:09- You... You don't like my singing? - No, it's not that, Colin.
0:02:09 > 0:02:11You should try breathing more from the diaphragm, you know?
0:02:11 > 0:02:15Not the lungs. And then expel the air, like this.
0:02:15 > 0:02:18SHE BELTS OUT POWERFUL NOTE
0:02:20 > 0:02:23Wow! Great pipes, Doctor.
0:02:23 > 0:02:25- Thanks. - Right.
0:02:25 > 0:02:29We're live in five, four, three, two, one.
0:02:31 > 0:02:35This just in from Jasmine, who wonders if dreaming has a use.
0:02:35 > 0:02:37Oh, oh, I know the answer to this one.
0:02:37 > 0:02:40Some scientists say that dreams help us to organise our memories,
0:02:40 > 0:02:43while others think they enhance our creativity.
0:02:43 > 0:02:46But others reckon it's just our brain making a story out of random
0:02:46 > 0:02:49- nerve activity. - So basically, we haven't a clue.
0:02:49 > 0:02:51Well, the truth is, science still hasn't solved
0:02:51 > 0:02:54the mystery of why we dream, but here are some things we do know.
0:02:54 > 0:02:56Finally, something.
0:02:56 > 0:02:59Babies spend more than twice as long in REM sleep as adults,
0:02:59 > 0:03:02which suggests that dreaming plays a role in brain development.
0:03:02 > 0:03:06The same is true of kittens and puppies.
0:03:06 > 0:03:08So you mean animals dream too?
0:03:08 > 0:03:12Well, some mammals have REM but what exactly they're dreaming about,
0:03:12 > 0:03:13we'll probably never know.
0:03:13 > 0:03:16Today's Big Answer!
0:03:16 > 0:03:19We really haven't the foggiest about dreaming, do we?
0:03:19 > 0:03:23Other than that it's got something to do with brain development...
0:03:23 > 0:03:25- Meh.- Fair enough.
0:03:25 > 0:03:28- So that's it for today.- See you next time. Sweet dreams, folks.
0:03:31 > 0:03:33And we're clear!
0:03:33 > 0:03:38Ahem. # La-la, la-la, la-la, la-la, la-la! #
0:03:38 > 0:03:42Oh, I know. I'm just a dreamer with no talent.
0:03:42 > 0:03:44- You do too.- I do?
0:03:44 > 0:03:46Well, you're the best floor manager ever.
0:03:48 > 0:03:51And who says dreams can't come true? Eh?