Caffeine Effects on Sleep Taken 0, 3, or 6 Hours before Going to Bed By devin, 30 December, 2015 http://www.aasmnet.org/JCSM/ViewAbstract.aspx?pid=29198 Takeaway: caffeine affects you 6 hours or more before bed. You must have JavaScript enabled to use this form. Your name Comment About text formats Plain text No HTML tags allowed. Web page addresses and email addresses turn into links automatically. Lines and paragraphs break automatically.