I have a question on Buspar. I take my 3x 5mg daily doses at:

6:00a
12:00p
6:00p

When I sleep what happens to the Buspar blood levels since there’s a 12 hour span between doses?

The first 6 hrs of that 12 hour span I still have Buspar working from the 6:00p dose, but what about the last 6 hours?