Hi again Moirah,
This topic just came up at CML Horizons 2016 conference. One of the doctor's there (Dr Rossi) spoke about he was not that concerned about taking imatinib at different times of day. In his words, taking an imatinib pill is "topping up a steady state" of the active drug in your body. His concern is completely missed doses.
Note that he was specifically talking about imatinib. Dasatinib has a shorter half-life so that advice may not apply to it or other TKIs.
That said, taking the pills at the same time each day can help you not to forget to take it at all as it forms a habit!
I hope this helps, and settles your nerves about not taking your pills at the very same time every day.
David