Sources for scientific journals are provided below. New videos come out every Thursday so subscribe for more videos.
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Sources
http://www01.ibm.com/common/ssi/cgi...
http://deepblue.lib.umich.edu/bitstre...

Relax
http://www.ncbi.nlm.nih.gov/pubmed/12...
http://www.tandfonline.com/doi/abs/10...
http://faculty.chicagobooth.edu/ayele...
http://www.researchgate.net/profile/D...

Take risks
http://www.nature.com/srep/2012/12111...
http://psycnet.apa.org/index.cfm?fa=f...
http://www.sciencedirect.com/science/...

Sleep
http://www.ncbi.nlm.nih.gov/pubmed/14...
http://www.psy.cmu.edu/~unsio/Sio_Orm...