---
title: Bright screens at night make the brain release less melatonin, the b… — Sleep and the body clock · tree and pragmatics
description: Bright screens at night make the brain release less melatonin, the body chemical that helps sleep. Who acts: Bright screens, brain, body chemical. A sentence of the lesson «Sleep and the body clock» of the world course of Mova's primary school with its dependency tree and the pragmatics of every cla
---

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# Sleep and the body clock, sentence 15

<!-- .ven lang=en -->
Bright screens at night make the brain release less melatonin, the body chemical that helps sleep.

<!-- .vintro -->
**Who acts:** Bright screens, brain, body chemical · **What happens:** make, release, help · **To what, where:** brain, less melatonin, sleep

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This is a sentence of the lesson «Sleep and the body clock» of the world course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (Bright screens, brain, body chemical), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:127-sleep-and-the-body-clock.lesson:15
# text = Bright screens at night make the brain release less melatonin, the body chemical that helps sleep.
# source = school lesson (ours)
# course = world
# lesson = 127-sleep-and-the-body-clock.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change
1	Bright	bright	ADJ	JJ	Degree=Pos	2	amod	_	_
2	screens	screen	NOUN	NNS	Number=Plur	5	nsubj	_	_
3	at	at	ADP	IN	_	4	case	_	_
4	night	night	NOUN	NN	Number=Sing	2	nmod	_	_
5	make	make	VERB	VBP	Mood=Ind|Tense=Pres|VerbForm=Fin	0	root	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	brain	brain	NOUN	NN	Number=Sing	5	obj	_	_
8	release	release	VERB	VB	VerbForm=Inf	5	xcomp	_	_
9	less	less	ADJ	JJR	Degree=Cmp	10	amod	_	_
10	melatonin	melatonin	NOUN	NN	Number=Sing	8	obj	_	_
11	,	,	PUNCT	,	_	14	punct	_	_
12	the	the	DET	DT	Definite=Def|PronType=Art	14	det	_	_
13	body	body	NOUN	NN	Number=Sing	14	compound	_	_
14	chemical	chemical	NOUN	NN	Number=Sing	10	appos	_	_
15	that	that	PRON	WDT	PronType=Rel	16	nsubj	_	_
16	helps	help	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	14	acl:relcl	_	_
17	sleep	sleep	NOUN	NN	Number=Sing	16	obj	_	_
18	.	.	PUNCT	.	_	5	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | Bright screens at night | the brain |  |  |  |  | tree rules |
| 2 | **release** | infinitive | the brain *not said here* | less melatonin |  |  |  |  | vn free-10.6.3-1 «NP V NP S\_ING»: agent=Causer melatonin=Source |
| 3 | **help** | present | the body chemical | sleep |  |  |  |  | vn help-72.1-1-1 «NP V NP»: agent=Agent sleep=Beneficiary |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:world:127-sleep-and-the-body-clock.lesson:15`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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- ← previous: [Sleep and the body clock, 14](https://md.mova.elamur.ai/free/en/corpora/school/world/127-sleep-and-the-body-clock/14/)
- next →: [Sleep and the body clock, 16](https://md.mova.elamur.ai/free/en/corpora/school/world/127-sleep-and-the-body-clock/16/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/world/127-sleep-and-the-body-clock/)