Reducing stress and improving lifestyle [diet & daily exercise] can help reduce your blood pressure.
Weight loss [if needed] and lifestyle changes particularly the Mediterranean diet, daily exercise, sleep management, stress reduction, and avoiding salt can help lower blood pressure.
Poor sleep quality increases risk of high blood pressure. American Heart Association Rapid Access Journal Report August 29, 2011 http://newsroom.heart.org/pr/aha/poor-sleep-quality-increases-risk-214099.aspx
Effect of longer term modest salt reduction on blood pressure: Cochrane systematic review and meta-analysis of randomised trials. 2013 Apr 3;346:f1325. http://www.ncbi.nlm.nih.gov/pubmed/23558162
Effect of lower sodium intake on health: systematic review and meta-analyses. BMJ. 2013 Apr 3;346:f1326. http://www.ncbi.nlm.nih.gov/pubmed/23558163