---
title: Bright screens and exciting games keep the brain alert and can delay… — Sleep and dreams in people · tree and pragmatics
description: Bright screens and exciting games keep the brain alert and can delay melatonin, the sleepy hormone that rises when it gets dark. Who acts: Bright screens, sleepy hormone, Sleep. A sentence of the lesson «Sleep and dreams in people» of the biology course of Mova's primary school with its dependency t
---

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# Sleep and dreams in people, sentence 13

<!-- .ven lang=en -->
Bright screens and exciting games keep the brain alert and can delay melatonin, the sleepy hormone that rises when it gets dark.

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**Who acts:** Bright screens, sleepy hormone, Sleep · **What happens:** keep, delay, rise, get · **To what, where:** brain, melatonin

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This is a sentence of the lesson «Sleep and dreams in people» of the biology 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, sleepy hormone, Sleep), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:363-sleep-and-dreams-in-people.lesson:13
# text = Bright screens and exciting games keep the brain alert and can delay melatonin, the sleepy hormone that rises when it gets dark.
# source = school lesson (ours)
# course = biology
# lesson = 363-sleep-and-dreams-in-people.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	6	nsubj	_	_
3	and	and	CCONJ	CC	_	5	cc	_	_
4	exciting	exciting	ADJ	JJ	Degree=Pos	5	amod	_	_
5	games	game	NOUN	NNS	Number=Plur	2	conj	_	_
6	keep	keep	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	brain	brain	NOUN	NN	Number=Sing	6	obj	_	_
9	alert	alert	ADJ	JJ	Degree=Pos	6	xcomp	_	_
10	and	and	CCONJ	CC	_	12	cc	_	_
11	can	can	AUX	MD	VerbForm=Fin	12	aux	_	_
12	delay	delay	VERB	VB	VerbForm=Inf	6	conj	_	_
13	melatonin	melatonin	NOUN	NN	Number=Sing	12	obj	_	_
14	,	,	PUNCT	,	_	17	punct	_	_
15	the	the	DET	DT	Definite=Def|PronType=Art	17	det	_	_
16	sleepy	sleepy	ADJ	JJ	Degree=Pos	17	amod	_	_
17	hormone	hormone	NOUN	NN	Number=Sing	13	appos	_	_
18	that	that	PRON	WDT	PronType=Rel	19	nsubj	_	_
19	rises	rise	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	17	acl:relcl	_	_
20	when	when	SCONJ	WRB	_	22	mark	_	_
21	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	22	nsubj	_	_
22	gets	get	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	19	advcl	_	_
23	dark	dark	ADJ	JJ	Degree=Pos	22	xcomp	_	_
24	.	.	PUNCT	.	_	6	punct	_	_
```

## Pragmatics {#pragmatics}

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

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **keep** | present | Bright screens and exciting games | the brain |  |  |  | alert *property* | vn keep-15.2 «NP V NP»: agent=Agent brain=Theme |
| 2 | **delay** | can | Bright screens and exciting games *not said here* | melatonin |  |  |  |  | vn delay-53.3-1-1 «NP V»: agent=Agent melatonin=Source |
| 3 | **rise** | present | the sleepy hormone |  |  |  |  |  | vn assuming\_position-50 «NP V»: agent=Agent |
| 4 | **get** | present | Sleep |  |  |  |  | dark *property* | vn comprehend-87.2-1 «NP V S\_ING»: agent=Experiencer |

<!-- .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:biology:363-sleep-and-dreams-in-people.lesson:13`.

**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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