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pennaMan

Yes, via melatonin

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1317110/

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I didn't know about that one.

What made me suspect sleep was a few studies showing that a lack of sleep has a negative effect on various hormones:

http://www.ncbi.nlm.nih.gov/pubmed/22844441

http://www.ncbi.nlm.nih.gov/pubmed/22787499

http://www.ncbi.nlm.nih.gov/pubmed/19955752

http://www.ncbi.nlm.nih.gov/pubmed/10543671

http://www.ncbi.nlm.nih.gov/pubmed/23078578

I found a couple studies on acne that mentions lack of sleep:

http://www.ncbi.nlm.nih.gov/pubmed/18348416

http://www.ncbi.nlm.nih.gov/pubmed/21595660

Artificial blue light does not contain UV light, and does not influence melatonin.

Doesn't matter whether the light is artificial or not. If the wavelength is about 470 nm (blue), it will suppress melatonin. There's been done many experiments/studies on this - here are a few:

https://www.ncbi.nlm.nih.gov/pubmed/11763987

https://www.ncbi.nlm.nih.gov/pubmed/14962066

https://www.ncbi.nlm.nih.gov/pubmed/20463367

https://www.ncbi.nlm.nih.gov/pubmed/22850476

https://www.ncbi.nlm.nih.gov/pubmed/19444752

https://www.ncbi.nlm.nih.gov/pubmed/20652045

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