Blood pressure is always higher in the morning. In fact most heart attacks happen in the morning; if you survive to the afternoon, your chances of suffering a heart attack go way down, amusingly enough :)One high BP reading doesn't mean much for anybody, on meth or not. It fluctuates quite a bit. If there's a good reason to be concerned, they usually hook you up with a blood pressure monitor that you carry around all day and automatically takes a reading every hour or so. Then what they do is look for patterns of high BP or a consistently high reading. One high reading like yours is pretty much nothing, especially since they're taking your BP every four hours already.In other words, if it's high again, they'll probably just shrug but may consider looking into it. If it's high a third time in a row, you're gonna get people asking questions and looking for a cause. But high once, even high once at the same time every day? They'll probably just keep on ignoring it (as they should).