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Home » How Daylight Could Help You Sleep: Christine Blume (Transcript)

How Daylight Could Help You Sleep: Christine Blume (Transcript)

Here is the full transcript of sleep scientist Christine Blume’s talk titled “How Daylight Could Help You Sleep” at TEDxBasel 2022 conference.

Listen to the audio version here:


On a usual Saturday, you wouldn’t find me here. And I mean, of course, I don’t give TEDx Talks every Saturday. But what I mean is you probably wouldn’t find me in a museum. Further, if you were looking for me, you’d probably have to go to the mountains.

And that is because I absolutely love hiking. And in addition to just being outside and being in the nature, what I really like is this feeling of physical exhaustion, sort of this satisfaction you can feel in every single muscle. And in the evening when it’s time to go to bed, I absolutely cherish this amazing sleepiness that fills you from head to toe.

Now, you might say, “Well, of course she’s tired. She’s been hiking all day.” Plus, not to forget about the effects of supposedly fresh air. But there is one factor that most likely outweighs the effects of fresh air and perhaps even physical activity, and that is exposure to natural daylight.

And today I hope to convince you that we should all appreciate daylight as sort of of a natural soporific. And hopefully by the end of the talk, you will also recognize that we should all pay more attention to our daily light diet.

The Importance of Daylight

But let’s start with a question, why daylight is so important for our organism, for health and eventually for sleep. Now, throughout your body, in each and every single cell, there is a tiny molecular clock ticking inside it. And to keep these millions of clocks in sync, we have one central body clock that is located in the brain in an area which we call the hypothalamus.

And like the conductor of an orchestra, it communicates the time of day to each of these molecular clocks. And this way it is able to regulate bodily processes in sync with the time of day. For example, it causes your body temperature to increase in the morning and to decrease in the evening.

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