Thank you for the response.<p>Could the difference, in those two kinds of situations, be due to the presence&#x2F;lack of awareness of the <i>trigger</i> of fear response?<p>To explain my thinking: it appears that you are normally aware of the fear-triggers on those &quot;stressful situations&quot; (i.e., <i>what</i> triggers the fear), which awareness of trigger in combination with propanelol&#x27;s inhibitiveness, leads to you have less nervous tics than usual (and less fear-responses). Whereas, it appears that on other kinds of situations, such as laying in bed running through dispersed thoughts about the upcoming day, there is no well-defined trigger (or so it seems) that can be pin-pointed in time, leading to propanelol not being as effective, thus resulting in racing thoughts.<p>The original study[1] involved a 2-minute exposure prior to administration of propanelol for it to be effective in eliminating the fear-conditioning. And this 2-minute exposure implicitly includes awareness of the fear-trigger.<p>[1] <a href="http:&#x2F;&#x2F;www.biologicalpsychiatryjournal.com&#x2F;article&#x2F;S0006-3223%2815%2900313-3&#x2F;abstract?showall=true=" rel="nofollow">http:&#x2F;&#x2F;www.biologicalpsychiatryjournal.com&#x2F;article&#x2F;S0006-322...</a>