Do I need IRB approval to study myeslf?
In general, single subject studies often do not require IRB review in the United States because they do not meet the federal definition of research (they are not "generalizable.") 

However, there are some exceptions to this rule. For example, a single subject oral history study or a single subject retrospective case study does not generally require IRB approval, but a single subject clinical study that involves collection of data that would not ordinarily be collected in the course of treatment does.

If you'd like to be sure, I suggest an email to your IRB.