1
00:00:12,912 --> 00:00:14,539
Out on the street,
2
00:00:14,614 --> 00:00:17,981
nighttime can be very busy.
3
00:00:20,887 --> 00:00:25,381
A time of lots of activity.
4
00:00:25,458 --> 00:00:29,417
Some other people are very active at night, too...
5
00:00:29,496 --> 00:00:32,294
... but they aren't awake.
6
00:00:32,365 --> 00:00:35,732
These people are sleepwalking.
7
00:00:39,372 --> 00:00:43,604
What exactly is sleepwalking?
8
00:00:43,676 --> 00:00:47,874
Many people think sleepwalkers are dreaming,
9
00:00:47,947 --> 00:00:51,906
and they are acting out their dreams.
10
00:00:51,985 --> 00:00:55,682
But this isn't true, scientists say.
11
00:00:56,990 --> 00:01:01,051
Sleepwalking is different.
12
00:01:01,127 --> 00:01:04,563
People sleepwalk because a lower part of the brain,
13
00:01:04,631 --> 00:01:09,000
seen here in red, "wakes up" during sleep.
14
00:01:09,069 --> 00:01:10,229
When this happens,
15
00:01:10,303 --> 00:01:14,706
a sleeping person might get out of bed...
16
00:01:14,774 --> 00:01:17,265
...and walk around.
17
00:01:24,417 --> 00:01:28,080
Some sleepwalkers even eat or drink.
18
00:01:28,154 --> 00:01:31,419
But they don't remember anything later.
19
00:01:35,295 --> 00:01:40,028
At some point in their lives, one in ten adults sleepwalks.
20
00:01:40,667 --> 00:01:43,295
But more children sleepwalk--
21
00:01:43,369 --> 00:01:46,600
almost one in five.
22
00:01:46,673 --> 00:01:49,301
Why do people sleepwalk?
23
00:01:49,375 --> 00:01:53,368
The main reason is not sleeping enough.
24
00:01:53,446 --> 00:01:55,710
Sometimes, people also sleepwalk
25
00:01:55,782 --> 00:01:58,842
if they drink too much alcohol,
26
00:02:00,353 --> 00:02:03,948
or if they feel stressed.
27
00:02:04,023 --> 00:02:08,460
Sleepwalkers are half awake and half asleep.
28
00:02:08,528 --> 00:02:12,965
And usually, it's hard to wake them up.
29
00:02:13,032 --> 00:02:14,761
But if someone sleepwalks,
30
00:02:14,834 --> 00:02:19,567
it's important to watch the person,
31
00:02:19,639 --> 00:02:23,336
because sleepwalkers can hurt themselves.
32
00:02:23,409 --> 00:02:27,436
If someone is sleepwalking, what can you do?
33
00:02:27,514 --> 00:02:32,042
The best thing is to walk the sleepwalker back to bed.
34
00:02:32,118 --> 00:02:35,815
And hopefully, they'll stay asleep there.