Sources on Youth Mental Health:

Trimbos Institute – Mental Health of Youth: Statistics and Trends

https://www.trimbos.nl/kennis/mentale-gezondheid-preventie/expertisecentrum-mentale-gezondheid/mentale-gezondheid-jeugd/cijfers

CBS – More Sleep Problems and Psychological Issues Among Youth

https://www.cbs.nl/nl-nl/nieuws/2023/45/meer-slaapproblemen-en-psychische-klachten-onder-jongeren

GGD Amsterdam – Factsheet Youth and Young Adults

https://www.ggd.amsterdam.nl/publish/pages/1043747/ggd-22-014-factsheet-monitors-jeugd-jongvolwassenen-web-wt22.pdf

Sources on the Effects of Volunteering by Youth:

Scientific American – Teens' Mental Health May Improve When They Help Others

https://www.scientificamerican.com/article/teens-mental-health-may-improve-when-they-help-others/

JFCS – 7 Reasons Why Volunteering Is Good for Teen Mental Health

https://ccy.jfcs.org/7-reasons-why-volunteering-is-good-for-teen-mental-health/

NAMI – How Volunteering Improves Mental Health

https://www.nami.org/Blogs/NAMI-Blog/February-2022/How-Volunteering-Improves-Mental-Health

Thrive Training – How Teens Benefit from Helping Others

https://www.thrivetrainingconsulting.com/how-teens-benefit-from-helping-others/

Sources on Loneliness Due to Phone Use:

Trimbos Institute – The impact of social media on well-being is not the same for all young people.

https://www.trimbos.nl/actueel/nieuws/de-impact-van-sociale-media-op-het-welzijn-is-niet-voor-alle-jongeren-hetzelfde 

(* Note: these sources are mainly based on Mental Health research in the Netherlands. However, these might differ from the situation in other countries. For relevant information concerning mental health in your country, please contact local or national organizations.)