1 00:03:52,430 --> 00:03:54,459 like lifestyle and creativity. 2 00:03:54,459 --> 00:03:58,400 And if you're one of the first 500 people who sign up using the link in the description 3 00:03:43,420 --> 00:03:47,920 VO: In fact, as well as courses like this one on how to get a better night's sleep, Skillshare, 4 00:03:47,930 --> 00:03:52,430 which is an online learning community, has loads of other courses to check out on topics 5 00:03:41,270 --> 00:03:42,800 for that? 6 00:03:37,959 --> 00:03:41,270 Though, if you do have trouble sleeping, did you know that there's a Skillshare course 7 00:03:36,780 --> 00:03:37,959 Sleep tight! 8 00:03:34,040 --> 00:03:36,780 sleep is for your body and your brain. 9 00:03:29,540 --> 00:03:34,040 CHARLIE: So, next time you're up past your bedtime, don't forget just how important a good night's 10 00:03:23,820 --> 00:03:26,420 MIKE: [YAWN] 11 00:03:16,720 --> 00:03:21,760 sense for groups to be able to coordinate times of activity and rest. 12 00:03:21,760 --> 00:03:23,820 CHARLIE: [YAWN] 13 00:03:06,320 --> 00:03:09,260 bring in a deep breath of nice, cool air. 14 00:03:12,400 --> 00:03:16,720 One theory behind why yawns are contagious is that, based on evolution, it would make 15 00:03:09,260 --> 00:03:11,000 [YAWN] 16 00:02:57,640 --> 00:03:01,840 VO: But now research is suggesting that as we get more tired the temperature regulations 17 00:03:01,840 --> 00:03:06,320 of our brain don't function as efficiently, and so to combat this our body forces us to 18 00:02:55,360 --> 00:02:57,640 at times when our breathing had slowed. 19 00:02:51,620 --> 00:02:55,360 You it used to be thought that yawning was a way of bringing more oxygen into the body 20 00:02:48,820 --> 00:02:50,440 [YAWN] 21 00:02:44,620 --> 00:02:48,820 CHARLIE: Man, all this talk about sleeping has made me feel very... 22 00:02:50,440 --> 00:02:51,620 Did I make you yawn? 23 00:02:33,750 --> 00:02:37,320 Why we dream is still a mystery to science but what we do know is that this is also when 24 00:02:41,880 --> 00:02:44,280 from acting out our dreams in real life. 25 00:02:30,140 --> 00:02:33,750 VO: REM sleep is also when we have some of our most vivid dreams. 26 00:02:24,880 --> 00:02:30,140 or REM sleep, during which our brains actually show as much activity as when we're awake. 27 00:02:37,320 --> 00:02:41,880 we enter sleep paralysis, which stops us from moving our bodies, thus helping prevent us 28 00:02:17,580 --> 00:02:19,980 we're going to hold on to this one forever! 29 00:02:03,080 --> 00:02:07,130 VO: With a healthy 7 to 8 hours each night, our mind can sort through all this information 30 00:02:19,980 --> 00:02:24,880 CHARLIE: After slow wave you enter the deepest part of the sleep cycle known as Rapid Eye Movement 31 00:02:07,130 --> 00:02:10,460 committing the useful stuff to memory and chucking the bits we don't need. 32 00:02:11,360 --> 00:02:17,580 MIKE: The humiliating feeling you got when you accidentally misgendered one of your co-workers... 33 00:01:50,200 --> 00:01:54,280 VO: Well, when we sleep, it gives our brains time to take stock of all the stimuli we've been 34 00:01:54,280 --> 00:01:56,020 subjected to throughout the day. 35 00:02:01,760 --> 00:02:03,080 GONE! 36 00:01:58,160 --> 00:02:01,760 MIKE: The name of the cute barista that smiled at you today... 37 00:01:43,730 --> 00:01:48,940 CHARLIE: So, we know how important sleep is for our bodies, but how about our brains? 38 00:01:37,700 --> 00:01:43,730 therapy, or CBT, might help as it's been shown to reduce these issues by 50% on average. 39 00:01:28,910 --> 00:01:33,460 VO: Obviously this is bad news for those of us who suffer from sleeping difficulties, though 40 00:01:33,460 --> 00:01:37,700 fortunately if you do have trouble getting a good night's sleep, cognitive behavioral 41 00:01:25,300 --> 00:01:28,900 with sleep deprivation being as dangerous as starvation. 42 00:01:20,540 --> 00:01:25,300 In fact, some studies have shown that sleep is as essential to our health as food, 43 00:01:07,300 --> 00:01:11,680 CHARLIE: This is when we enter the stage of sleep known as slow wave, or deep sleep, 44 00:01:02,840 --> 00:01:05,860 We even experience a decrease in body temperature. 45 00:01:11,680 --> 00:01:16,200 during which our bodies do some amazing things like repairing themselves and releasing growth hormones, 46 00:01:18,420 --> 00:01:20,540 MIKE: [SNORE] 47 00:01:16,200 --> 00:01:18,420 all of which is essential for our health. 48 00:00:53,200 --> 00:00:56,780 What we know now is that it's more like your body gets dialed down. 49 00:00:57,740 --> 00:01:02,200 Our breathing slows, our heart rate lowers and the muscles in our body relax. 50 00:00:47,200 --> 00:00:51,720 VO: But of course, if our bodies did just turn off like this, we'd all be quite dead. 51 00:00:44,440 --> 00:00:45,680 MIKE: Goodnight. 52 00:00:41,920 --> 00:00:43,160 turned off. 53 00:00:38,520 --> 00:00:41,920 VO: Now it used to be thought that when you went to sleep your body just sort of... 54 00:00:34,460 --> 00:00:37,940 What we do know about sleep however, is just how important it really is. 55 00:00:30,320 --> 00:00:34,460 yet to agree on exactly why our bodies tempt us into bed every night. 56 00:00:25,600 --> 00:00:30,320 30 years of your life asleep, which is crazy when you consider that scientists are still 57 00:00:21,660 --> 00:00:25,600 If you're lucky enough to live until you're 90, chances are you would have spent about 58 00:00:16,680 --> 00:00:21,660 [FUN SCIENCE THEME SONG] 59 00:00:11,940 --> 00:00:15,060 Looks like you might need a lesson in the importance of a good night's sleep, 60 00:00:07,300 --> 00:00:09,540 You frightened the life out of me! 61 00:00:09,540 --> 00:00:11,180 What on earth are you doing up so late? 62 00:00:15,060 --> 00:00:16,680 in this episode of... 63 00:00:00,400 --> 00:00:03,140 VO: This episode of Fun Science is brought to you by Skillshare. 64 00:04:07,300 --> 00:04:08,220 Bye bye. 65 00:00:06,000 --> 00:00:07,300 CHARLIE: [YELP!] 66 00:04:02,970 --> 00:04:07,300 So, go and learn, or go and sleep, and thanks for watching! 67 00:03:58,400 --> 00:04:02,970 you'll get your first two months for free, giving you access to all the courses on Skillshare.